Asset Purchase Agreement, dated November 16, 2021, by and between the Registrant and Janssen Biotech, Inc

Exhibit 10.1

ASSET PURCHASE AGREEMENT

BY AND BETWEEN

JANSSEN BIOTECH, INC.

AND

MIRUM PHARMACEUTICALS, INC.

November 16, 2021

TABLE OF CONTENTS

-i-

-ii-

List of Exhibits

-iii-

ASSET PURCHASE AGREEMENT

This ASSET PURCHASE AGREEMENT (this “Agreement”) is made and entered into as of November 16, 2021 (the “Effective Date”), by and between JANSSEN BIOTECH, INC., a corporation organized under the laws of Pennsylvania (“Buyer”), and MIRUM PHARMACEUTICALS, INC., a corporation organized under the laws of Delaware (“Seller”). Buyer and Seller may hereinafter be referred to individually as a “Party” and collectively as the “Parties.”

RECITALS

WHEREAS, Seller and Buyer each (a) desire that Buyer purchase from Seller, and Seller sell, transfer and assign to Buyer, the Purchased Assets (as defined below), all on the terms set forth herein (such transaction, the “Asset Purchase”) and (b) in furtherance thereof, have adopted and approved this Agreement and, upon the terms and subject to the conditions set forth in this Agreement, have adopted and approved the Asset Purchase as contemplated by this Agreement in accordance with all applicable Legal Requirements (as defined below).

WHEREAS, Seller and Buyer desire to make certain representations, warranties, covenants and other agreements as set forth herein in connection with the Asset Purchase contemplated by this Agreement.

NOW, THEREFORE, in consideration of the foregoing and their mutual undertakings hereinafter set forth, and intending to be legally bound, the Parties agree as follows:

ARTICLE 1

DEFINITIONS

1.1    Certain Definitions. As used in this Agreement, the following capitalized terms shall have the meanings indicated below:

(a)    “Action” means any claim, audit, examination, action, cause of action or suit (whether in contract or tort or otherwise), litigation (whether at law or in equity, whether civil or criminal), assessment, arbitration, mediation, investigation, hearing, charge, complaint, demand, notice or proceeding.

(b)    [Reserved].

(c)    “Affiliate” means any Person which, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with, a Party to this Agreement, for so long as such control exists, whether such Person is or becomes an Affiliate on or after the Effective Date. A Person shall be deemed to “control” another Person if it: (i) owns, directly or indirectly, beneficially or legally, at least fifty percent (50%) of the outstanding capital stock, voting securities or other ownership interest (or such lesser percentage which is the maximum allowed to be owned by such Person in a particular jurisdiction) of such other Person (or, with respect to a limited partnership or other similar entity, its general partner or controlling entity) or (ii) has the power, whether pursuant to Contract, ownership of securities or otherwise, to direct the management and policies of such other Person.

(d)    “Alternative Transaction” means, other than the transactions contemplated by this Agreement, any proposal or offer from any Person or group of Persons (other than Buyer or its Affiliates or their respective Representatives) for any acquisition by, or transfer, assignment, encumbrance, license or other grant of rights or disposition to, such Person or group of Persons of any right, title or interest in or to the Purchased Assets; provided, that “Alternative Transaction” shall not include any acquisition of

substantially all of Seller’s assets (whether through a stock purchase, merger, sale of all or substantially all assets or otherwise) so long as such acquisition provides that this Agreement continues to be binding, enforceable and in full force and effect on the same terms in effect as of the Effective Date.

(e)    “Approval Letters” means, collectively, the letter, dated September 29, 2021, and the corrected letter, dated October 20, 2021, from the FDA to Seller, issuing the FDA Approval and granting the Priority Review Voucher, attached hereto as Exhibit A.

(f)    “Asset Purchase” has the meaning set forth in the Recitals.

(g)    “Business Day” means a day (i) other than Saturday or Sunday and (ii) on which commercial banks are open for business in New York, New York, United States.

(h)    “Confidential Disclosure Agreement” means that certain Confidential Disclosure Agreement by and between the Parties (including their Affiliates), dated November 2, 2021.

(i)    “Consent” means any and all filings, authorizations, consents, approvals, notices, permits, orders, registrations or declarations.

(j)    “Contract” means any written or oral legally binding contract, agreement, instrument, commitment or undertaking (including leases, licenses, mortgages, notes, guarantees, sublicenses, subcontracts and purchase orders).

(k)    “DOJ” means the United States Department of Justice.

(l)    “Encumbrance” means any lien, pledge, charge, mortgage, owner’s mortgage, easement, encroachment, imperfection of title, title exception, title defect, right of possession, right of negotiation or refusal, leasehold interest, security interest, encumbrance, adverse claim, interference, or other restriction on transfer, ownership or use.

(m)    “FDA” means the U.S. Food and Drug Administration.

(n)    “FDA Approval” means the commercial marketing authorization issued by the FDA to Seller relating to NDA 214662 for Livmarli (maralixibat) oral solution in accordance with Section 505(b)(1) of the FFDCA on September 29, 2021.

(o)    “FFDCA” means the United States Federal Food, Drug, and Cosmetic Act, 21 U.S.C. § 301 et seq., as amended from time to time, together with any rules, regulations and requirements promulgated thereunder (including all additions, supplements, extensions, and modifications thereto).

(p)    “FTC” means the United States Federal Trade Commission.

(q)    “Fundamental Representations” means the representations and warranties contained in Section 3.1 (Organization; Standing and Power), Section 3.2 (Due Authority), Section 3.3(b)(i) (No Contravention), Section 3.5 (Title to Purchased Assets), Section 3.11 (Revocation; Use of Purchased Assets), Section 3.12 (Marketed Product) and Section 3.13 (Brokers).

(r)    “Governmental Entity” means any supranational, national, state, municipal, local or foreign government, any court, tribunal, arbitrator, administrative agency, commission or other governmental official, authority or instrumentality, in each case whether domestic or foreign, any stock exchange or similar self-regulatory organization or any quasi-governmental, private body or arbitral body exercising any executive, legislative, judicial, quasi-judicial, regulatory, taxing, administrative or other governmental or quasi-governmental authority.

2

(s)    “HSR Act” means the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended from time to time, and the rules and regulations promulgated thereunder.

(t)    “Indemnified Party” means any of the Buyer Indemnified Parties or Seller Indemnified Parties, as applicable.

(u)    “Indemnifying Party” means any Person against whom a claim for indemnification is being asserted under any provision of Article 8.

(v)    “Judgment” means any orders, writs, injunctions, awards, judgments, settlements, stipulations, determinations and decrees entered by or with any Governmental Entity.

(w)    “Knowledge” means, with respect to Seller, the actual knowledge of the facts and information of the executive officers of Seller, after performing a reasonable inquiry with respect to such facts and information.

(x)    “Law” means any federal, state, foreign, local, municipal or other law, statute, constitution, principle of common law, resolution, ordinance, code, edict, decree, rule, regulation, ruling or requirement issued, enacted, adopted, promulgated, implemented or otherwise put into effect by or under the authority of any Governmental Entity.

(y)    “Legal Requirement” means any Law, or any Judgment, or any license, franchise, authorization of any Governmental Entity or similar right granted under any of the forgoing, or any similar provision having the force or effect of Law applicable to a Party or to any of its assets, properties or businesses. Legal Requirements shall include, with respect to Seller or its Affiliates, any requirements, conditions or obligations relating to the Priority Review Voucher set forth in the FFDCA or the Approval Letters or in any other correspondence received by Seller or its Affiliates from the FDA regarding the Priority Review Voucher.

(z)    “Liabilities” means all debts, liabilities and obligations, whether presently in existence or arising hereafter, accrued or fixed, absolute or contingent, matured or unmatured, determined or determinable, asserted or unasserted, known or unknown, including those arising under any Law, Action or governmental order and those arising under any Contract.

(aa)    “Losses” means all losses, Liabilities, damages, claims, causes of action, Judgments, awards, suits, Taxes, fines, penalties, costs or expenses (including reasonable attorneys’ and experts’ fees and expenses).

(bb)    “Market” or “Marketing” means to market a drug within the meaning of Section 529(e)(1) of the FFDCA.

(cc)    “Person” means any natural person, company, corporation, limited liability company, general partnership, limited partnership, trust, proprietorship, joint venture, business organization or Governmental Entity.

(dd)    “Priority Review” means a priority review of and action upon a human drug application, which is submitted under Section 505(b)(1) or 505(b)(2) of the FFDCA or under Section 351 of the Public Health Service Act, by the FDA not later than six (6) months after the receipt of such application by the FDA, as defined in Section 529(a)(1) of the FFDCA.

3

(ee)    “Priority Review Voucher” means the priority review voucher assigned tracking number PRV NDA 214662 issued by the Secretary of the Department of Health and Human Services pursuant to Section 529(b)(1) of the FFDCA to Seller, as evidenced by the Approval Letters, that entitles the holder to Priority Review of a single human drug application.

(ff)    “Proceeding” means any action, arbitration, audit, hearing, investigation, litigation or suit (whether civil, criminal, administrative, judicial or investigative, whether formal or informal, whether public or private) commenced, brought, conducted or heard by or before, or otherwise involving, any Governmental Entity or arbitrator.

(gg)    “Purchased Assets” means (i) the Priority Review Voucher and (ii) any and all rights, benefits and entitlements with respect thereto afforded to the holder of the Priority Review Voucher .

(hh)    “Rare Pediatric Disease Product Application” means the rare pediatric disease product application, as defined in Section 529(a)(4) of the FFDCA, that earned the Priority Review Voucher.

(ii)    “Regulatory Change” means any (i) changed or additional Legal Requirement, amendment, supplement or interpretation to any then-existing Legal Requirement or (ii) additional, amended or supplemented term or condition that is not set forth in the Approval Letters imposed on the Priority Review Voucher or a party seeking to use or transfer the Priority Review Voucher, that in either case of (i) or (ii) has been enacted, adopted, approved, or imposed by a Governmental Entity with appropriate jurisdiction over the matter between the Effective Date and the Closing Date and adversely impacts or limits the manner in which Buyer may use, receive, hold, transfer or otherwise exploit the Priority Review Voucher.

(jj)    “Representative” means, with respect to a particular Person, any director, officer, manager, employee, agent, consultant, advisor, accountant, financial advisor, legal counsel or other representative of that Person.

(kk)    “Tax” or “Taxes” means any and all domestic and foreign, federal, state, provincial, local, municipal and other taxes, fees, levies, duties, tariffs, imposts and like assessments or charges in the nature of a tax, including taxes or charges on, or measured by or with respect to, gross or net income, gain, gross receipts, capital, franchise, windfall and other profits, sales, use, real or personal property, payroll, as well as any value added, ad valorem, transfer, license, withholding, employment, unemployment, excise, severance, stamp, occupation, municipal, municipal surcharge, environmental, social security, escheat, unclaimed property and other tax, together with any interest or any penalty thereon and addition thereto, whether disputed or not, and including (i) the Tax liability of any other Person imposed pursuant to Treasury Regulations Section 1.1502-6 or any similar provision of other tax Law and (ii) the obligation to indemnify or assume or otherwise succeed to the Tax liability of any other Person, by Contract or pursuant to any Law.

(ll)    “Third Party” means any Person other than a Party and such Party’s Affiliates.

Other capitalized terms defined elsewhere in this Agreement and not defined in this Section 1.1 shall have the meanings assigned to such terms in this Agreement.

4

ARTICLE 2

PURCHASE AND SALE; CLOSING

2.1    Purchase and Sale of Purchased Assets.

(a)    Upon the terms and subject to the conditions of this Agreement, at and as of the Closing (as defined in Section 2.3), Buyer shall purchase from Seller and Seller shall sell, transfer, convey, assign and deliver to Buyer all of Seller’s right, title and interest in and to the Purchased Assets free and clear of all Encumbrances. Seller shall perform all actions necessary to facilitate the transfer of the Purchased Assets to Buyer.

(b)    Except as expressly set forth in the last two sentences of Section 5.5 of this Agreement, Buyer shall not assume, nor shall it be liable for, or otherwise be obligated to pay, perform or discharge, any Liabilities of Seller or its Affiliates, including any Liabilities arising from or related to Seller’s ownership prior to the Closing of any rights with respect to the Purchased Assets (such Liabilities, the “Excluded Liabilities”). Seller shall be solely responsible for all such Excluded Liabilities.

2.2    Purchase Price. The total consideration to be paid by Buyer for all of the Purchased Assets shall be ONE HUNDRED TEN MILLION U.S. DOLLARS (U.S. $110,000,000) (the “Purchase Price”). Buyer shall pay the Purchase Price to Seller on the Closing Date in United States dollars by wire transfer of immediately available funds to a bank account specified by Seller in accordance with the written wire instructions provided by Seller to Buyer at least seven (7) Business Days prior to the expected Closing Date.

2.3    Closing. The closing of the transactions contemplated hereby (the “Closing”) shall take place remotely via the electronic exchange of documents and signatures, at 10:00 a.m. Eastern Time on the second Business Day following the date on which all of the conditions precedent set forth in Article 6 have been satisfied or waived (other than conditions to be satisfied only by the delivery of certificates or other documents at the Closing, but subject to the satisfaction or waiver of such conditions at the Closing), or at such other time and place as the Parties may mutually agree in writing. The date on which the Closing actually takes place is referred to in this Agreement as the “Closing Date.”

2.4    Title Passage; Delivery of Purchased Assets.

(a)    Title Passage. Upon the Closing, all of the right, title and interest in and to the Purchased Assets shall pass to Buyer free and clear of all Encumbrances.

(b)    Filings; Notifications. Buyer and Seller agree to cooperate and assist each other with respect to all filings or notifications to the FDA related to the transfer and assignment of the Purchased Assets.

2.5    Closing Deliveries by Seller. At the Closing, Seller shall deliver to Buyer the following:

(a)    an executed Bill of Sale substantially in the form attached hereto as Exhibit 2.5(a);

(b)    a letter addressed to Buyer and a copy of the joint FDA notification cover letter, substantially in the form set forth on Exhibit 2.5(b)(i) and Exhibit 2.5(b)(ii) hereto, respectively, (or such other form as the FDA may require as of the Closing Date) and duly executed by Seller, acknowledging the transfer of the Priority Review Voucher from Seller to Buyer, in accordance with applicable Legal Requirements.

5

(c)    a certificate of Seller dated as of the Closing Date, in the form set forth in Exhibit 2.5(c), duly executed by Seller, certifying as to the satisfaction of the conditions set forth in Sections 6.2(a) and 6.2(b); and

(d)    a certificate of Seller dated as of the Closing Date, in the form set forth in Exhibit 2.5(d), duly executed by Seller, certifying as to the resolutions of the Board of Directors of Seller authorizing the execution, delivery and performance of this Agreement, the transactions contemplated hereunder and authorizing the person or persons executing this Agreement on behalf of Seller or any instrument delivered, or to be delivered, hereunder to so execute and deliver such instrument.

2.6    Closing Deliveries by Buyer. At the Closing, Buyer shall deliver to Seller the following:

(a)    payment of the Purchase Price in accordance with Section 2.2;

(b)    an executed Bill of Sale substantially in the form attached hereto as Exhibit 2.5(a);

(c)    a letter addressed to Seller and a copy of the joint FDA notification cover letter, substantially in the form set forth on Exhibit 2.6(c) and Exhibit 2.5(b)(ii) hereto, respectively (or such other form as the FDA may require as of the Closing Date) and duly executed by Buyer, acknowledging the transfer of the Priority Review Voucher from Seller to Buyer, which letters Buyer shall submit to the FDA along with the letter addressed to Buyer described in Section 2.5(b) within 30 days of the Closing, in accordance with applicable Legal Requirements; and

(d)    a certificate of Buyer dated as of the Closing Date, in the form set forth in Exhibit 2.6(d), duly executed by Buyer, certifying as to the satisfaction of the conditions set forth in Sections 6.1(a) and 6.1(b).

2.7    Withholding. Buyer (and any agent or Affiliate of Buyer) shall be entitled to deduct and withhold from the amounts payable pursuant to this Agreement to Seller all amounts that such Person is required to deduct and withhold under any Legal Requirement; provided, however, that the Parties shall use commercially reasonable efforts to reduce and minimize any such withholding or deduction, or to obtain, at Seller’s cost, a refund of previously withheld amounts, to the maximum extent permitted by Legal Requirements; provided, further, that Buyer shall not be required to submit any confidential information of Buyer in connection with any of the foregoing activities. Amounts so deducted and withheld under this Section 2.7 and remitted to the appropriate taxing authority shall be treated for all purposes of this Agreement as having been delivered and paid to Seller under this Agreement. Buyer shall promptly remit any amounts withheld and deducted on account of taxes to the appropriate taxing authority.

2.8    Transfer Taxes and Fees. The Purchase Price is exclusive of any and all transfer, conveyance, recordation and similar Taxes, fees or duties assessed or incurred by reason of the sale by Seller or the purchase by Buyer of the Purchased Assets hereunder (“Transfer Taxes”). Such Transfer Taxes shall be paid by the Party that is primarily liable for such Taxes, fees or duties under applicable Law, and such Person shall timely file any applicable tax return and timely remit such Transfer Taxes to the appropriate taxing authority.

2.9    Indirect Taxes. The Purchase Price is exclusive of any applicable value added, sales, consumption, goods and services taxes or other similar Taxes required under applicable law to be disclosed as a separate item on an invoice by reason of the sale by Seller or the purchase by Buyer of the Purchased Assets hereunder (“Indirect Tax”). Buyer shall be responsible for any Indirect Taxes, which shall be added to the Purchase Price and promptly paid to Seller in substantially the same manner as the Purchase Price upon receipt of a valid invoice furnished by Seller to Buyer setting forth in detail such any Indirect Taxes.

6

Each Party shall use commercially reasonable efforts to avail itself of any available exemptions from Indirect Taxes and agrees to cooperate in good faith with the other Party and provide any information and documentation that may be necessary to minimize the amount of Indirect Taxes. Should any taxing authority determine that a transaction contemplated by this Agreement should be subject to an Indirect Tax that was not paid to the appropriate taxing authority and Seller is required to pay such Indirect Taxes to such taxing authority, Buyer shall pay to Seller or its relevant Affiliates the applicable amount of such Indirect Tax on the basis of a valid invoice furnished by Seller to Buyer setting forth in detail such Indirect Taxes.

2.10    Broker and Other Party Fees and Royalties. Notwithstanding any other provision in this Agreement to the contrary, Seller shall bear and pay any and all fees, royalties, and expenses that may become payable by Seller or its Affiliates in connection with any arrangements or other agreements made by Seller or its Affiliates with any broker, finder, investment banker or other party in connection with the purchase and sale of the Purchased Assets hereunder or any of the other transactions contemplated by this Agreement.

ARTICLE 3

REPRESENTATIONS AND WARRANTIES OF SELLER

Seller hereby represents and warrants to Buyer, as of the Effective Date and the Closing Date (or in the case of representations and warranties that are made as of a specified date, as of such specified date) as follows:

3.1    Organization, Standing and Power. Seller is a corporation duly organized, validly existing and in good standing under the laws of the State of Delaware. Seller has the requisite corporate power and authority to own, operate and lease its properties and to carry on its business as presently conducted and is duly qualified or licensed to do business and is in good standing in each jurisdiction where the character of its properties owned or leased or the nature of its activities make such qualification or licensing necessary, except where the failure to be so qualified or licensed would not, individually or in the aggregate, reasonably be expected to adversely affect any of the Purchased Assets, Seller’s ability to consummate the transactions contemplated by this Agreement, or Buyer’s ownership and rights with respect to any of the Purchased Assets after the Closing. Seller is not in violation of its certificate of incorporation or bylaws, in each case, as amended to date.

3.2    Due Authority. Seller has all requisite corporate power and authority to execute and deliver, perform its obligations under, and consummate the transactions contemplated by, this Agreement. The execution, delivery and performance of this Agreement, and the consummation of the Asset Purchase, have been duly and validly authorized by all necessary corporate action on the part of Seller. This Agreement has been duly executed and delivered by Seller. This Agreement, upon due execution and delivery by the Parties, will constitute a valid and binding obligation of Seller enforceable against Seller in accordance with its terms, subject only to the effect, if any, of (a) applicable bankruptcy and other similar Laws affecting the rights of creditors generally and (b) rules of Law governing specific performance, injunctive relief and other equitable remedies (whether considered in an action at Law or in equity).

3.3    No Contravention. The execution and delivery by Seller of this Agreement does not, and the consummation of the transactions contemplated hereby, including the transfer of title to, ownership in, and possession of the Purchased Assets, will not, (a) result in the creation of any Encumbrance on the Purchased Assets or (b) conflict with, or result in any violation of or default under (with or without notice or lapse of time, or both), or give rise to a right of termination, revocation, suspension, cancellation or acceleration of any obligation or loss of any benefit under, or require any consent, approval or waiver from any Person pursuant to, (i) any provision of the certificate of incorporation or bylaws of Seller, in each case

7

as amended to date, (ii) the Priority Review Voucher, the Approval Letters or any Contract to which Seller or any Affiliate of Seller is a party or bound which involves or affects in any way any of the Purchased Assets, or (iii) except as may be required to comply with the HSR Act, any Legal Requirements applicable to Seller or any Affiliate of Seller or any of the Purchased Assets.

3.4    No Consents. Except for (a) any Antitrust Approval (as defined in Section 5.3(b)) required by the HSR Act and (b) the letters referenced in Section 2.5(b) and 2.6(c) no Consent of a Governmental Entity or any other Person, is necessary or required in connection with the execution, delivery and performance by Seller of this Agreement, and the consummation by Seller or its Affiliates of the transactions contemplated hereby.

3.5    Title to Purchased Assets. Seller is the sole and exclusive owner of all right, title and interest in and to the Purchased Assets and owns good and transferable title to the Purchased Assets free and clear of any Encumbrances. Seller has performed all actions necessary to perfect its ownership of, and its ability to transfer, the Purchased Assets. Seller has the full right to sell, transfer, convey, assign and deliver the Purchased Assets to Buyer at the Closing free and clear of all Encumbrances and, at the Closing, will sell, transfer, convey, assign and deliver to Buyer good and transferable title to the Purchased Assets free and clear of any Encumbrances.

3.6    Contracts. Except for this Agreement, there is no Contract to which Seller or any of its Affiliates is a party to or bound by that involves or affects the issuance of, ownership of, transfer or licensing of, title to, or use of any of the Purchased Assets, or that otherwise assigned, transferred, licensed, conveyed or encumbered, or granted or allowed to exist any Encumbrance with respect to, any of Seller’s right, title or interest in, to or under the Purchased Assets.

3.7    Compliance with Legal Requirements. Seller and its Affiliates are, and at all times have been, in compliance with all Legal Requirements that are or were applicable to the Purchased Assets. None of Seller or any of its Affiliates has received any written or oral notice or other communication from any Person regarding any actual or alleged violation of, or failure to comply with, any such Legal Requirement.

3.8    [Reserved].

3.9    Legal Proceedings. There is no pending or, to Seller’s Knowledge, threatened, Action involving Seller or any of its Affiliates, nor has there been an Action involving Seller or any of its Affiliates, and neither Seller nor any of its Affiliates are a party or subject to the provisions of any Judgment, (a) that involves or affects (or may involve or affect) the issuance of, continued validity of, ownership of, transfer or license of, title to, or use of any of the Purchased Assets, including any such Action or Judgment that seeks to prohibit or limit in any respect, or place any conditions on, the ownership or use by Buyer or its Affiliates of any of the Purchased Assets, in each case as a result of the transactions contemplated by this Agreement, (b) that otherwise challenges or seeks to restrain, prohibit, prevent, enjoin, alter or delay the consummation of the transactions contemplated by this Agreement, or (c) that seeks to obtain from Buyer or any of its Affiliates in connection with the transactions contemplated by this Agreement any damages or which would result in the transactions contemplated hereby being rescinded following consummation. To the Knowledge of Seller, there is no fact or circumstance that would reasonably be expected to serve as a basis for any of the foregoing Actions.

3.10    Governmental Authorizations. Neither Seller nor any of its Affiliates is required to hold any license, registration, or permit issued by any Governmental Entity to own, use or transfer the Purchased Assets, other than such licenses, registrations or permits that have already been obtained.

8

3.11    Revocation; Use of Purchased Assets. The Priority Review Voucher was awarded to Seller by the FDA in respect of Seller’s sponsorship of a Rare Pediatric Disease Product Application pursuant to Section 529(b)(1) of the FFDCA. The Priority Review Voucher has been duly granted and issued and has not been terminated, redeemed, transferred, suspended, cancelled or revoked and to Seller’s Knowledge there are no facts or circumstances that could reasonably be expected to (with or without notice or lapse of time, or both) result in the termination, suspension, cancellation or revocation of the Priority Review Voucher by a Governmental Entity, give rise to a right of the FDA to revoke the Priority Review Voucher, result in the redemption or (other than pursuant to transactions contemplated by this Agreement) transfer of the Priority Review Voucher, or that could reasonably be expected to preclude or interfere with the sale and transfer of the Purchased Assets to Buyer or Buyer’s use of the Purchased Assets following the Closing to obtain Priority Review or any other benefits associated with the Purchased Assets. There is no term or condition imposed by the FDA on the Priority Review Voucher as of the date hereof that is not set forth in the Approval Letters or provided for under applicable Law. Seller has provided to Buyer true and complete copies of the Approval Letters and all other correspondence submitted or received by Seller or any of its respective Affiliates regarding the Priority Review Voucher. Neither Seller nor any of its Affiliates has notified the FDA, pursuant to Section 529(b)(4)(B)(i) of the FFDCA, of an intent to use the Priority Review Voucher.

3.12    Marketed Product. Seller has initiated, and since initiation has continued, Marketing in the United States of the product that was the subject of the Rare Pediatric Disease Product Application for which the Priority Review Voucher was awarded.

3.13    Brokers. Except for Jefferies LLC, no broker, finder or investment banker is entitled to any brokerage or finder’s fee in connection with the purchase and sale of the Purchased Assets hereunder or any of the other transactions contemplated by this Agreement based upon arrangements made by or on behalf of Seller or its Affiliates.

3.14    Solvency. Seller is not entering into this Agreement with the actual intent to hinder, delay, or defraud any creditor of Seller or any Affiliate of Seller. The remaining assets of Seller after the Closing will not be unreasonably small in relation to the business in which Seller will engage after the Closing. After the Closing, Seller will not be insolvent and will have the ability to pay its debts as they become due.

3.15    No Other Representations. Neither Seller nor any of its Affiliates or their respective Representatives is making any representation or warranty of any kind or nature whatsoever, oral or written, express or implied, except as otherwise expressly set forth in this Article 3 or in any other certificate or other document delivered by or on behalf of Seller or any of its Affiliates pursuant to this Agreement.

ARTICLE 4

REPRESENTATIONS AND WARRANTIES OF BUYER

Buyer hereby represents and warrants to Seller as of the Effective Date and as of the Closing Date as follows:

4.1    Organization, Standing and Power. Buyer is a corporation duly organized, validly existing and in good standing under the laws of the State of Pennsylvania. Buyer has the requisite corporate power and authority to own, operate and lease its properties and to carry on its business as presently conducted and is duly qualified or licensed to do business and is in good standing in each jurisdiction where the character of its properties owned or leased or the nature of its activities make such qualification or licensing necessary, except where the failure to be so qualified or licensed would not, individually or in the aggregate, reasonably be expected to materially adversely affect Buyer’s ability to consummate the transactions contemplated by this Agreement. Buyer is not in violation of its certificate of incorporation or bylaws, in each case, as amended to date.

9

4.2    Authority. Buyer has all requisite corporate power and authority to execute and deliver, perform its obligations under, and consummate the transactions contemplated by, this Agreement. The execution, delivery and performance of, and the consummation of the transactions contemplated by, this Agreement have been duly and validly approved and authorized by all necessary corporation action. This Agreement has been duly executed and delivered by Buyer. This Agreement, upon due execution and delivery by the Parties, will constitute a valid and binding obligation of Buyer, enforceable against Buyer in accordance with its terms, subject only to the effect, if any, of (a) applicable bankruptcy and other similar Laws affecting the rights of creditors generally and (b) rules of Law governing specific performance, injunctive relief and other equitable remedies (whether considered in an action at Law or in equity).

4.3    No Contravention. The execution and delivery by Buyer of this Agreement does not, and the consummation of the transactions contemplated hereby will not, conflict with, or result in any violation of or default under (with or without notice or lapse of time, or both), or give rise to a right of termination, cancellation or acceleration of any obligation or loss of any benefit under, or require any consent, approval or waiver from any Person pursuant to, (a) any provision of the organizational or governing documents of Buyer, in each case as amended to date, (b) any Contract to which Buyer or any Affiliate of Buyer is a party or bound by or by which it or its assets or properties are bound or under which Buyer or any Affiliate of Buyer has material rights or benefits, or (c) except as may be required to comply with the HSR Act, any Legal Requirements applicable to Buyer.

4.4    No Consents. Except for (a) any Antitrust Approval (as defined in Section 5.3(b)) required by the HSR Act and (b) the letters referenced in Section 2.5(b) and Section 2.6(c), no Consent of any Governmental Entity or any other Person is necessary or required in connection with the execution, delivery and performance by Buyer of this Agreement or the consummation by Buyer or its Affiliates of the transactions contemplated hereby.

4.5    Brokers. No broker, finder or investment banker is entitled to any brokerage or finder’s fee in connection with the purchase and sale of the Purchased Assets hereunder or any of the other transactions contemplated by this Agreement based upon arrangements made by or on behalf of Buyer or its Affiliates.

4.6    Non-Reliance. Except for the representations and warranties expressly set forth in Article 3 or in any other certificate or document delivered by or on behalf of Seller or any of its Affiliates pursuant to this Agreement, neither Seller nor any of its Affiliates or their respective Representatives makes, or has made any representation or warranty, oral or written, express or implied, relating to Seller, the Purchased Assets or otherwise in connection with the Asset Purchase, and Seller and its Affiliates and their respective Representatives expressly disclaim any liability with respect thereto. Except for the representations and warranties expressly set forth in Article 3 or in any other certificate or document delivered by or on behalf of Seller or any of its Affiliates pursuant to this Agreement, Buyer has not relied, and is not relying, on any representation or warranty of Seller or any of its Affiliates relating to Seller, the Purchased Assets or otherwise in connection with the Asset Purchase.

ARTICLE 5

COVENANTS

5.1    Efforts. During the period from the Effective Date and continuing until the earlier of the termination of this Agreement or the Closing Date (the “Pre-Closing Period”), except as otherwise expressly contemplated by this Agreement or with such other Party’s prior written consent, which consent

10

shall not be unreasonably withheld, conditioned or delayed, each Party shall not, and shall cause its Affiliates not to, knowingly take or permit any action that, or omit to take any action the absence of which, could reasonably be expected to prevent the satisfaction of the conditions set forth in Article 6.

5.2    No Solicitation.

(a)    During the Pre-Closing Period, Seller shall not, nor shall it authorize, instruct or permit any of its Affiliates or its or their Representatives, to (i) solicit, initiate, facilitate or encourage any inquiries, proposals or offers with respect to, or the submission of, any Alternative Transaction by any Person (other than Buyer or its Affiliates or their respective Representatives) or any inquiry, proposal or offer that is reasonably likely to lead to an Alternative Transaction, (ii) engage, continue or participate in any discussions or negotiations regarding, or take any other action intended or reasonably expected to facilitate the making of any inquiry, proposal or offer to Seller that constitutes, or may reasonably be expected to lead to, any Alternative Transaction by any Person (other than Buyer or its Affiliates or their respective Representatives) other than to state that they are not permitted to have discussions, (iii) accept any inquiry, proposal or offer from any Person (other than Buyer) in respect of an Alternative Transaction, or (iv) resolve to propose or agree to do any of the foregoing.

(b)    If, during the Pre-Closing Period, Seller or any of its Representatives receives any inquiries, proposals or offers with respect to or that could reasonably be expected to lead to, or the submission of, any Alternative Transaction by any Person (other than Buyer or its Affiliates or their respective Representatives), Seller shall promptly (and, in any event, within 24 hours) advise Buyer orally and in writing of any such inquiry, proposal or offer, and subject to any existing confidentiality obligations, the terms and conditions thereof and the identity of the person making any such inquiry, proposal or offer. During the Pre-Closing Period, subject to any existing confidentiality obligations, Seller shall keep Buyer fully informed as to the material details (including material amendments or proposed amendments) of any such inquiry, proposal or offer, and promptly upon receipt or delivery thereof (and, in any event, within 24 hours), provide Buyer with copies of all documents and written or electronic communications relating to any such inquiry, proposal or offer exchanged between Seller or its Representatives, on the one hand, and the person making any such inquiry, proposal or offer or such person’s Representatives, on the other hand. Seller’s covenant under Section 5.2(a) shall not be relieved or diminished upon the receipt of any such inquiry, proposal or offer.

(c)    Without limiting Section 5.2(a), it is understood that any violation of the restrictions set forth in Section 5.2(a) by any Person covered by Section 5.2(a), whether or not such Person is purporting to act on behalf of Seller, shall be deemed to be a breach of Section 5.2(a) by Seller.

5.3    Antitrust Notification.

(a)    Unless this Agreement shall have been validly terminated in accordance with Section 7.1, subject to the limitations set forth in this Agreement (including in Section 5.3(b)), Buyer and Seller shall use reasonable best efforts to cause the prompt expiration or termination of any applicable waiting period and to consummate the transactions contemplated hereunder, including within five (5) Business Days after the Effective Date, filing with the FTC and the DOJ the premerger notification and report form required as a result of the contemplated purchase and sale of the Purchased Assets and the other transactions contemplated hereby, and including any supplemental information requested in connection therewith, pursuant to the HSR Act. Any such filing, notification and report form and supplemental information shall be in substantial compliance with the requirements of the HSR Act. The Parties shall work together and shall furnish to one another such necessary information and reasonable assistance as the other may request in connection with its preparation of any filing or submission which is necessary under the HSR Act. The Parties shall use reasonable best efforts to (i) cooperate with one another and promptly

11

inform the other Party of any communications with, and any inquiries or requests for additional information from, the FTC, the DOJ or any other applicable Governmental Entity, (ii) comply promptly with any such reasonable inquiry or request, allowing the other to review in advance of submission, and considering in good faith the views of the other, in connection with any substantive responses, analyses, appearances, presentations, memoranda, briefs, arguments and proposals, (iii) not participate, or permit its Affiliates to participate, in any substantive meeting or discussion with any Governmental Entity in respect of any filings, investigation or inquiry concerning this Agreement unless it consults with the other Party in advance and, to the extent permitted by such Governmental Entity, gives the other Party the opportunity to attend and participate thereat, and (iv) with the exception of business documents designated and deemed highly confidential or competitively sensitive by the possessing Party (including documents submitted as attachments to the Party’s notification and report form under the HSR Act), furnish the other Party or the other Party’s outside counsel with copies of all substantive correspondence, filings, and communications (and memoranda setting forth the substance thereof) between a Party or its Affiliates, on the one hand, and any Governmental Entity, on the other hand, with respect to the transactions contemplated hereunder or any investigation with respect to the transactions contemplated hereunder, provided that the Parties may as they deem advisable and necessary, redact as necessary to remove legally privileged content, valuation details or to comply with contractual arrangements. Buyer shall pay all filing fees for the filing under the HSR Act.

(b)    From and after the date on which the filings are made pursuant to Section 5.3(a), Buyer and Seller shall use reasonable best efforts to obtain any clearance required under the HSR Act (the “Antitrust Approval”), including replying at the earliest practicable date to any requests for information received from the FTC or DOJ pursuant to the HSR Act. Notwithstanding the foregoing, in connection with and as a result of any Antitrust Approval granted during the Pre-Closing Period, nothing in this Agreement shall require, or be construed to require, the Parties or any of their respective Affiliates to offer or agree to (i) (A) sell, hold, separate, divest, license, discontinue, or limit any assets, businesses, equity, holdings, intellectual property, or other interests or (B) any conditions relating to, or changes or restrictions in, the operation or use of any such assets, businesses, equity holdings, intellectual property or interests (including but not limited to any requirements to enter into new Contracts or modify or terminate existing Contracts), including with respect to the Purchased Assets and use of the Priority Review Voucher to obtain Priority Review of a product candidate of Buyer or its Affiliates or any other benefit associated with the Purchased Assets or (ii) any material modification or waiver of the terms and conditions of this Agreement.

5.4    Expenses. Whether or not the purchase and sale of the Purchased Assets and the other transactions contemplated by this Agreement are consummated, and except as otherwise set forth in this Agreement, each of the Parties shall bear its own fees and expenses incurred or owed in connection with the purchase and sale of the Purchased Assets, this Agreement and the transactions contemplated hereby.

5.5    Further Assurances. Subject to the limitations set forth in Section 5.3, during the Pre-Closing Period, and from and after the Closing, the Parties shall cooperate reasonably with each other in connection with any steps required to be taken as part of their respective obligations under this Agreement, including without limitation any notifications or filings required to be made to the FDA in connection with the transfer of the Purchased Assets, and shall, at no expense to the other Party, (a) furnish upon request to each other such further information, (b) execute and deliver to each other such other documents, and (c) do such other acts and things, all as the other Party may reasonably request for the purpose of carrying out the intent of this Agreement and the transactions contemplated by this Agreement, including the use of the Purchased Assets to obtain Priority Review. The Parties agree that the user fees to be paid in connection with the use of the Priority Review Voucher by Buyer or any subsequent transferee of the Priority Review Voucher, and all other user fees under the FFDCA applicable to the human drug application for which the Priority Review Voucher is redeemed, shall be borne exclusively by Buyer or any such subsequent transferee of the Priority Review Voucher. In any such event, Seller shall have no liability or obligation for any such fees.

12

5.6    Public Announcements. Except as may be required by applicable Law or as may be required to comply with the requirements of any applicable stock exchange or any Governmental Entity, including the U.S. Securities and Exchange Commission (“SEC”), neither Party shall (i) other than with respect to a press release substantially in the form of Exhibit 5.6, disclose the existence or terms of this Agreement (other than disclosures to Representatives on a need-to-know basis and who are bound by confidentiality terms substantially no less stringent than the terms of the Confidential Disclosure Agreement) or (ii) issue any press release, publication, or other public announcement relating to this Agreement, the performance of this Agreement, or that otherwise identifies the other Party as a party to this Agreement, in each case without the consent of the other Party (such consent not to be unreasonably withheld, conditioned or delayed). To the extent practicable, the disclosing Party shall give at least three (3) Business Days’ advance notice of any disclosure to the non-disclosing Party (including a copy of the proposed disclosure), and the non-disclosing Party may provide any comments on the proposed disclosure during the foregoing time period; provided, that such disclosing Party shall be under no obligation to accept any such comments provided by the non-disclosing Party. Each Party acknowledges that the other Party, or the other Party’s parent entity, as a publicly traded company, is legally obligated to make timely disclosures of material events relating to its business. The Parties acknowledge that either or both Parties may be obligated to file a copy of this Agreement with the SEC. Without limiting the foregoing, any Party so obligated shall provide the other Party with a reasonable opportunity to review and request confidential treatment of this Agreement pursuant to applicable rules under the Securities Exchange Act of 1934, as amended, and the Freedom of Information Act and the rules promulgated thereunder to permit the filing of a redacted exhibit. The Party so obligated shall give due consideration to the other Party’s request and, if agreed by the Parties, use reasonable efforts to obtain such confidential treatment or permission to redact such exhibit; provided that the Parties acknowledge that there is no assurance that such redactions will be permitted by the SEC and the SEC may require filing of the Agreement in full. Notwithstanding anything to the contrary in this Section 5.6, either Party may, without prior submission to or approval of the other Party (but with at least three (3) Business Days’ advance notice to the other Party), issue press releases or public announcements incorporating information concerning this Agreement which information was included in a press release or public disclosure which was previously disclosed under the terms of this Agreement.

5.7    Compliance with Legal Requirements. Seller shall, and shall cause its Affiliates and each of their respective successors in interest and assigns to the Rare Pediatric Disease Product Application for which the Priority Review Voucher was awarded, to comply at all times with all Legal Requirements applicable to the Purchased Assets, including any and all Legal Requirements applicable to the validity, maintenance, use or transfer of the Priority Review Voucher. Seller shall promptly forward to Buyer any written communications or notices (and shall promptly notify Buyer of any oral communications or notices) it or its Affiliates receive from any Governmental Entity to the extent relating to or otherwise materially impacting the Purchased Assets; provided that Seller may redact any portion of such written communications or other notices that is not relevant to the Purchased Assets. Without limiting the generality of the foregoing, to the extent required, now or in the future, under applicable Legal Requirements or otherwise by the FDA for the maintenance, use or transfer of the Priority Review Voucher, or to avoid revocation of the Priority Review Voucher, Seller shall, and shall cause its Affiliates and each of their respective successors in interest and assigns to the Rare Pediatric Disease Product Application for which the Priority Review Voucher was awarded, to submit a post-approval production report to the FDA not later than five (5) years after the FDA Approval in accordance with Section 529(e)(2) of the FFDCA.

5.8    Marketing. Seller shall, and shall cause its Affiliates and each of their respective successors in interest and assigns to, within the three hundred sixty-five (365) day period beginning on the

13

date of the FDA Approval, Market in the United States the rare pediatric disease product that was approved in the Rare Pediatric Disease Product Application to the extent and in a manner required, now or in the future, under applicable Legal Requirements or otherwise by any applicable Governmental Entity to preclude the FDA from exercising its authority to revoke the Priority Review Voucher pursuant to Section 529(e)(1) of the FFDCA or as otherwise required for the use or transfer of the Priority Review Voucher.

5.9    Other Covenants. During the Pre-Closing Period, (i) Seller shall, and shall cause each of its Affiliates to, maintain the Priority Review Voucher in full force and effect and provide Buyer with prompt written notice to the extent Seller becomes aware of any Regulatory Change, (ii) Seller shall not, and shall cause each of its Affiliates not to, (A) enter into any Contract with respect to the Purchased Assets or (B) take or permit, or omit to take any action that would reasonably be expected to adversely affect any of the Purchased Assets, Seller’s or any of its Affiliates’ ability to consummate the transactions contemplated by this Agreement or Buyer’s ownership and rights with respect to any of the Purchased Assets after the Closing, and (iii) Seller shall, and shall cause each of its Affiliates to, provide Buyer with prompt written notice of the occurrence or non-occurrence of any event the occurrence or non-occurrence of which has caused or would reasonably be expected to cause any condition to the obligations of Seller to effect the Closing or the failure of Seller to comply with or satisfy in any material respect any covenant to be complied with or satisfied by Seller pursuant to this Agreement; provided the failure by Seller to give notice of any such occurrence as required pursuant to this Section 5.9 with respect to a breach of or inaccuracy in a representation or warranty contained herein shall not, in and of itself, render such breach or inaccuracy to become a failure to comply with a covenant. Such notices provided pursuant to this Section 5.9 shall not be deemed to amend, modify or supplement any representation or warranty provided by Seller in this Agreement or any certificate or document delivered hereunder and shall not operate as a waiver or otherwise affect or impair any of Buyer’s rights under this Agreement (including with respect to Article 7 and Article 8).

ARTICLE 6

CONDITIONS PRECEDENT TO CLOSING

6.1    Conditions Precedent to Seller’s Obligation. The obligation of Seller to consummate the transactions contemplated by this Agreement is subject to the satisfaction or waiver on or prior to the Closing Date of the following conditions:

(a)    Representations and Warranties of Buyer. Each of the representations and warranties of Buyer made in Article 4 shall be true and correct (without giving effect to any limitation or qualification as to “materiality” (including the word “material”) or “material adverse effect” set forth therein) in all material respects as of the Effective Date and as of the Closing Date (or in the case of representations and warranties that are made as of a specified date, such representations and warranties shall be true and correct as of such specified date).

(b)    Compliance with Agreements and Covenants. Buyer and its Affiliates shall have performed in all material respects all obligations and agreements and complied in all material respects with all covenants and conditions required by this Agreement to be performed or complied with by Buyer or any such Affiliate on or before the Closing Date.

(c)    Antitrust. Any waiting period (or extension thereof) applicable to the transactions contemplated by this Agreement under the HSR Act shall have been terminated or shall have expired.

(d)    No Injunction or Legal Restraint. No Governmental Entity shall have enacted, issued, promulgated, enforced or entered any Law nor shall any temporary restraining order, preliminary

14

or permanent injunction or other order or decree have been issued or be pending by any court of competent jurisdiction that is in effect and which has the effect of, or that if in effect would have the effect of, making the transactions contemplated by this Agreement illegal or otherwise preventing, prohibiting or restraining the consummation of the transactions contemplated by this Agreement.

(e)    Closing Deliveries. Buyer shall have made the deliveries contemplated under Section 2.6.

6.2    Conditions Precedent to Buyer’s Obligation. The obligation of Buyer to consummate the transactions contemplated by this Agreement is subject to the satisfaction or waiver on or prior to the Closing Date of the following conditions:

(a)    Representations and Warranties of Seller. Each of the representations and warranties of Seller made in Article 3, other than the Fundamental Representations, shall be true and correct (without giving effect to any limitation or qualification as to “materiality” (including the word “material”) or “material adverse effect” set forth therein) in all material respects as of the Effective Date and as of the Closing Date (or in the case of representations and warranties that are made as of a specified date, such representations and warranties shall be true and correct as of such specified date). The Fundamental Representations shall be true and correct in all respects as of the Effective Date and as of the Closing Date (or in the case of representations and warranties that are made as of a specified date, such representations and warranties shall be true and correct as of such specified date).

(b)    Compliance with Agreements and Covenants. Seller and its Affiliates shall have performed in all material respects all obligations and agreements and complied in all material respects with all covenants and conditions required by this Agreement to be performed or complied with by Seller or any such Affiliate on or before the Closing Date.

(c)    Antitrust. Any waiting period (or extension thereof) applicable to the transactions contemplated by this Agreement under the HSR Act shall have been terminated or shall have expired.

(d)    No Injunction or Legal Restraint. No Governmental Entity shall have enacted, issued, promulgated, enforced or entered any Law nor shall any temporary restraining order, preliminary or permanent injunction or other order or decree have been issued or be pending by any court of competent jurisdiction that is in effect and which has the effect of, or that if in effect would have the effect of, making the transactions contemplated by this Agreement illegal or otherwise preventing, prohibiting or restraining the consummation of the transactions contemplated by this Agreement.

(e)    Closing Deliveries. Seller shall have made the deliveries contemplated under Section 2.5.

(f)    No Regulatory Change. There shall not have occurred and remain in effect any Regulatory Change.

ARTICLE 7

TERMINATION

7.1    Termination. This Agreement may be terminated, and the transactions contemplated hereby may be abandoned, at any time prior to Closing:

(a)    by mutual written consent of Buyer and Seller;

15

(b)    by Buyer or Seller, if the Closing has not occurred by 11:59 p.m. Eastern time on the date that is ninety (90) days following the Effective Date (the “Outside Date”); provided, that the right to terminate this Agreement shall not be available to any Party whose breach of any provision set forth in this Agreement is the primary cause of the failure of the Closing to occur on or before the Outside Date;

(c)    by Buyer or Seller, if (i) any Law having the effect referred to in Section 6.2(d) or Section 6.1(d), as applicable, has been enacted, issued, promulgated, enforced or entered or (ii) any order, injunction or decree having the effect referred to in Section 6.2(d) or Section 6.1(d), as applicable, is in effect and has become final and non-appealable;

(d)    by Buyer, if Buyer is not in material breach of its obligations under this Agreement and there has been a violation or breach by Seller of any of its representations, warranties, covenants or other agreements contained in this Agreement, which has prevented or would prevent the satisfaction of any condition to the obligations of Buyer at the Closing set forth in Section 6.2, and (i) such violation or breach has not been waived by Buyer, (ii) Buyer has provided written notice to Seller of such violation or breach setting forth the allegations of violation or breach in reasonable detail, and (iii) such violation or breach cannot be or has not been cured by Seller within twenty (20) Business Days after receiving written notice thereof from Buyer (provided that in no event shall such twenty (20) Business Day extend beyond the Outside Date); or

(e)    by Seller, if Seller is not in material breach of its obligations under this Agreement and there has been a violation or breach by Buyer of any of its representations, warranties, covenants or other agreements contained in this Agreement, which has prevented or would prevent the satisfaction of any condition to the obligations of Seller at the Closing set forth in Section 6.1 and (i) such violation or breach has not been waived by Seller, (ii) Seller has provided written notice to Buyer of such violation or breach setting forth the allegations of violation or breach in reasonable detail, and (iii) such violation or breach cannot be or has not been cured by Buyer within twenty (20) Business Days after receiving written notice thereof from Seller (provided that in no event shall such twenty (20) Business Day extend beyond the Outside Date).

7.2    Effect of Termination. If this Agreement is terminated and the transactions contemplated hereby are abandoned as described in this Article 7, this Agreement shall become void and of no further force or effect, except that (i) the provisions of this Section 7.2, Sections 5.4 and 5.6, and Article 1 and Article 9 shall survive the termination of this Agreement and shall remain in full force and effect and (ii) the Confidential Disclosure Agreement shall survive termination in accordance with its terms, and there shall be no liability on the part of Buyer or Seller except for damages from any material and intentional breach by such Party of this Agreement prior to the effective date of such termination.

ARTICLE 8

INDEMNIFICATION AND LIMITATIONS OF LIABILITY

8.1    Indemnification.

(a)    Indemnification by Seller. From and after the Closing, Seller shall indemnify, defend and hold Buyer and its Affiliates and its and their respective directors, officers, employees and agents (each, a “Buyer Indemnified Party”) harmless for, from and against any and all Losses, whether or not arising from, relating to or otherwise in connection with a claim of a Third Party (each, a “Third Party Claim”), which any Buyer Indemnified Party may suffer, incur, sustain or become subject to, to the extent arising from, relating to or otherwise in connection with (i) any breach of or inaccuracy in any representations and warranties of Seller made under this Agreement or any certificate or document delivered hereunder; (ii) any breach of or failure to perform any covenants or obligations of Seller made under this Agreement or any certificate or document delivered hereunder; (iii) all Excluded Liabilities; and (iv) any fraud or intentional misrepresentation of Seller in connection with this Agreement.

16

(b)    Indemnification by Buyer. From and after the Closing, Buyer shall indemnify, defend and hold harmless Seller and its Affiliates, and its and their respective directors, officers, employees and agents (each, a “Seller Indemnified Party”) from and against any and all Losses, whether or not arising from, relating to or otherwise in connection with a Third Party Claim, which any Seller Indemnified Party may suffer, incur, sustain or become subject to, to the extent arising from, relating to or otherwise in connection with (i) any breach of or inaccuracy in any representations and warranties of Buyer made under this Agreement or any certificate or document delivered hereunder; (ii) any breach of or failure to perform any covenants or obligations of Buyer made under this Agreement or any certificate or document delivered hereunder; and (iii) any fraud or intentional misrepresentation of Buyer in connection with this Agreement.

8.2    Notice of Loss.

(a)    In order for an Indemnified Party to be entitled to any indemnification provided for under Section 8.1(a) or 8.1(b) in respect of, arising out of or involving a Third Party Claim, such Indemnified Party must notify the applicable Indemnifying Party in writing of the Third Party Claim (including in such notice a brief description of the applicable claim(s), including damages sought or estimated, to the extent actually known by such Indemnified Party) within 20 business days after receipt by such Indemnified Party of actual notice of the Third Party Claim; provided, however, that failure to give such notification shall not affect the indemnification provided under Section 8.1(a) or 8.1(b) except to the extent the Indemnifying Party has been actually prejudiced as a result of such failure.

(b)    If the Indemnifying Party has acknowledged in writing to the Indemnified Party the Indemnifying Party’s responsibility for defending and indemnifying the Indemnified Party with respect to such Third Party Claim (subject to the limitations set forth in Section 8.6), the Indemnifying Party shall have the right to defend (with counsel reasonably selected by the Indemnifying Party and approved by the Indemnified Party, such approval not to be unreasonably withheld, conditioned or delayed), at its sole cost and expense, such Third Party Claim (other than a class action, a criminal matter or a claim in which non-monetary equitable or injunctive relief against the Indemnified Party is sought) by all appropriate proceedings, which proceedings shall be prosecuted diligently by the Indemnifying Party to a final conclusion or settled at the discretion of the Indemnifying Party; provided, however, that the Indemnifying Party may not enter into any compromise or settlement unless (i) such compromise or settlement includes as an unconditional term thereof, the giving by each claimant or plaintiff to the Indemnified Party of a release from all liability in respect of such Third Party Claim; and (ii) the Indemnified Party consents to such compromise or settlement, which consent shall not be withheld or delayed unless such compromise or settlement involves (A) any admission of legal wrongdoing by the Indemnified Party, (B) any payment by the Indemnified Party that is not indemnified hereunder or (C) the imposition of any equitable relief against the Indemnified Party, in which case for clauses (A) - (C) above, the Indemnified Party may withhold its consent in its sole discretion. If the Indemnifying Party does not elect to assume control of the defense of a Third Party Claim or if a good faith and diligent defense is not being or ceases to be materially conducted by the Indemnifying Party, the Indemnified Party shall have the right, at the expense of the Indemnifying Party, upon at least ten (10) Business Days’ prior written notice to the Indemnifying Party of its intent to do so, to undertake the defense of such Third Party Claim for the account of the Indemnifying Party (with counsel reasonably selected by the Indemnified Party and approved by the Indemnifying Party, such approval not to be unreasonably withheld or delayed), provided, that the Indemnified Party shall keep the Indemnifying Party apprised of all material developments with respect to such Third Party Claim and promptly provide the Indemnifying Party with copies of all correspondence and documents exchanged by the Indemnified Party and the opposing party(ies) to such litigation. The Indemnified Party may not compromise or settle such litigation without the prior written consent of the Indemnifying Party, such consent not to be unreasonably withheld or delayed.

17

(c)    The Indemnified Party may participate in, but not control, any defense or settlement of any Third Party Claim controlled by the Indemnifying Party pursuant to this Section 8.2 and shall bear its own costs and expenses with respect to such participation; provided, however, that the Indemnifying Party shall bear such costs and expenses if counsel for the Indemnifying Party shall have reasonably determined that such counsel may not properly represent both the Indemnifying Party and the Indemnified Party.

(d)    In order for an Indemnified Party to be entitled to any indemnification provided for under this Agreement other than in respect of, arising out of or involving a Third Party Claim, such Indemnified Party shall deliver notice of such claim with reasonable promptness to the Indemnifying Party (including in such notice a brief description of the applicable claim(s), including damages sought or estimated, to the extent actually known by such Indemnified Party, and the Section(s) of this Agreement upon which such claim for indemnification is then based); provided, however, that failure to give such notification shall not affect the indemnification provided under Section 8.1(a) or 8.1(b) except to the extent the Indemnifying Party has been actually prejudiced as a result of such failure.

8.3    Survival. The representations and warranties of Seller and Buyer under this Agreement, and liability for the breach thereof, shall survive the Closing Date and shall remain in full force and effect for a period of two (2) years following the Closing Date; provided, however, that all covenants, the Fundamental Representations and any claims for fraud or intentional misrepresentation shall survive the Closing Date and shall remain in full force and effect for a period of six (6) years following the Closing Date. No claim for breach of any representation, warranty, covenant or agreement may be brought after expiration of the survival periods set forth in this Section 8.3. Notwithstanding the foregoing, if written notice of a claim has been given in the manner required by Section 8.2 prior to the expiration of the applicable survival period by the Party seeking indemnification for such claim, then the relevant covenants, representations and warranties of the other Party shall survive as to such claim until such claim has been finally resolved pursuant to this Article 8.

8.4    Additional Indemnification Matters. The right of indemnification provided under this Article 8 shall not be affected by any knowledge acquired (or capable of being acquired) at any time, whether before or after the Effective Date, with respect to the accuracy or inaccuracy of, or compliance or noncompliance with, any representation, warranty, covenant or agreement contained herein.

8.5    Adjustments. Any amount paid under this Article 8 shall be treated as an adjustment to the Purchase Price for all Tax purposes unless otherwise required by applicable Law.

8.6    Additional Limitations of Liability. Notwithstanding anything to the contrary set forth in this Agreement, except in the case of fraud, the maximum aggregate amount of indemnifiable Losses that may be recovered from Seller by the Buyer Indemnified Parties on the one hand, or by Buyer from the Seller Indemnified Parties on the other hand, shall equal the Purchase Price. NOTWITHSTANDING ANYTHING TO THE CONTRARY SET FORTH IN THIS AGREEMENT, EXCEPT FOR ANY RIGHT TO INDEMNIFICATION UNDER THIS ARTICLE VIII, NO PARTY HERETO SHALL HAVE ANY LIABILITY UNDER ANY PROVISION OF THIS AGREEMENT FOR (I) EXCEPT FOR RELIEF MANDATED BY STATUTE, ANY PUNITIVE, INCIDENTAL, SPECIAL, EXEMPLARY, MULTIPLIED, INDIRECT, CONSEQUENTIAL LOSS OF BUSINESS REPUTATION OR OPPORTUNITY OR LOST PROFITS/REVENUES DAMAGES OR (II) THE OTHER PARTY’S ATTORNEY FEES, COSTS AND PREJUDGMENT INTEREST. The limitations specified in this Section 8.6 will survive the termination of the Agreement.

18

8.7    Exclusive Remedy. From and after the Closing, this Article 8 will provide the exclusive remedy against either Party for any breach of any representation, warranty, covenant or other claim arising out of or relating to this Agreement and/or the transactions contemplated hereby, except nothing in this Agreement will prevent or otherwise limit either Party from seeking or obtaining injunctive or other equitable relief for any breach of any covenant or agreement set forth herein or making any claim in the event of fraud. The Parties hereto agree that the provisions in this Agreement relating to indemnification, and the limits imposed on Buyer’s remedies with respect to this Agreement and the transactions contemplated hereby, were specifically bargained for between sophisticated parties and were specifically taken into account in the determination of the amounts to be paid to Seller hereunder.

ARTICLE 9

GENERAL PROVISIONS

9.1    Notice Requirements. Any notice, request, demand, waiver, consent, approval, or other communication permitted or required under this Agreement shall be in writing, shall refer specifically to this Agreement and shall be deemed given only if (a) delivered by hand, (b) sent by nationally recognized overnight delivery service that maintains records of delivery, addressed to the Parties at their respective addresses specified in this Section 9.1 or to such other address as the Party to whom notice is to be given may have provided to the other Party in accordance with this Section 9.1, or (c) sent by email as a PDF attachment. Such notice shall be deemed to have been given (a) as of the date delivered by hand, (b) on the second Business Day (at the place of delivery) after deposit with a nationally recognized overnight delivery service, or (c) the first Business Day following transmission by email if no automated notice of delivery failure is received by the sender. Any notice delivered by email shall be confirmed by a hard copy delivered as soon as practicable thereafter.

If to Buyer, to:

Janssen Biotech, Inc.

800 Ridgeview Drive

Horsham, PA 19044

Attention: President

with a copy (which shall not constitute notice) to:

Johnson & Johnson

Law Department

One Johnson & Johnson Plaza

New Brunswick, NJ 08933

Attention: General Counsel, Pharmaceuticals

Covington & Burling LLP

The New York Times Building

620 Eighth Avenue

New York, NY 10018

Attention: Stephen A. Infante

Email: ***@***

If to Seller, to:

Mirum Pharmaceuticals, Inc. 950 Tower Lane

Suite 1050

Foster City, California 94404

Email: ***@***

Attention: Legal Department

19

with a copy (which shall not constitute notice) to:

Cooley LLP

55 Hudson Yards

New York, NY 10001-2157

Attn: Jason Kent

Email: ***@***

9.2    Construction. Except where the context otherwise requires, wherever used, the singular shall include the plural, the plural the singular, the use of any gender shall be applicable to all genders and the word “or” is used in the inclusive sense (and/or). Whenever this Agreement refers to a number of days, unless otherwise specified, such number refers to calendar days. The captions of this Agreement are for convenience of reference only and in no way define, describe, extend, or limit the scope or intent of this Agreement or the intent of any provision contained in this Agreement. The term “including,” “include,” or “includes” as used herein shall mean “including, but not limited to,” and shall not limit the generality of any description preceding such term. The words “will” and “shall” have the same meaning. “Extent” in the phrase “to the extent” means the degree to which a subject or other thing extends, and such phrase does not mean simply “if.” The language of this Agreement shall be deemed to be the language mutually chosen by the Parties and no rule of strict construction shall be applied against either Party hereto. Each Party represents that it has been represented by legal counsel in connection with this Agreement and acknowledges that it has participated in the drafting hereof. In interpreting and applying the terms and provisions of this Agreement, the Parties agree that no presumption will apply against the Party which drafted such terms and provisions.

9.3    References. Unless otherwise specified, (a) references in this Agreement to any Article, Section, Schedule or Exhibit shall mean references to such Article, Section, Schedule or Exhibit of this Agreement, (b) references in any Section to any clause are references to such clause of such Section, and (c) references to any agreement, instrument, or other document in this Agreement refer to such agreement, instrument, or other document as originally executed or, if subsequently amended, replaced, or supplemented from time to time, as so amended, replaced, or supplemented and in effect at the relevant time of reference thereto.

9.4    Entire Agreement; Amendments. This Agreement, the documents, Exhibits and Schedules referred to herein, and the Confidential Disclosure Agreement sets forth and constitutes the entire agreement and understanding between the Parties with respect to the subject matter hereof and all prior agreements, understandings, promises, and representations, whether written or oral, with respect thereto are superseded hereby. Each Party confirms that it is not relying on any representations or warranties of the other Party except as specifically set forth in this Agreement. No amendment, modification, release, or discharge shall be binding upon the Parties unless in writing and duly executed by authorized Representatives of both Parties.

9.5    Assignment. Without the prior written consent of the other Party neither Party shall sell, transfer, assign, delegate, pledge, or otherwise dispose of, whether voluntarily, involuntarily, by operation of law or otherwise, this Agreement or any of its rights or duties hereunder; provided, that (a) either Party may make such an assignment without the other Party’s consent to any of its Affiliates and (b) Buyer may make such an assignment, in whole or in part, without Seller’s consent, to any Affiliate, purchaser, transferee, or assignee of the Purchased Assets. With respect to any permitted assignment, the assigning Party shall remain responsible for the performance by such permitted assignee of the assigning Party’s

20

duties and obligations hereunder. Any attempted assignment or delegation in violation of this Section 9.5 shall be void and of no effect. All validly assigned and delegated rights and obligations of the Parties hereunder shall be binding upon and inure to the benefit of and be enforceable by and against the successors and permitted assigns of Buyer or Seller, as the case may be.

9.6    Severability. If any provision of this Agreement is held to be illegal, invalid, or unenforceable under any present or future law, and if the rights or obligations of either Party under this Agreement will not be materially and adversely affected thereby, (a) such provision shall be fully severable; (b) this Agreement shall be construed and enforced as if such illegal, invalid, or unenforceable provision had never comprised a part hereof; (c) the remaining provisions of this Agreement shall remain in full force and effect and shall not be affected by the illegal, invalid, or unenforceable provision or by its severance herefrom; and (d) in lieu of such illegal, invalid, or unenforceable provision, there shall be added automatically as a part of this Agreement a legal, valid, and enforceable provision as similar in terms to such illegal, invalid, or unenforceable provision as may be possible and reasonably acceptable to the Parties. To the fullest extent permitted by applicable Law, each Party hereby waives any provision of Law that would render any provision hereof illegal, invalid, or unenforceable in any respect.

9.7    Governing Law. This Agreement or the performance, enforcement, breach or termination hereof shall be interpreted, governed by and construed in accordance with the laws of the State of Delaware, United States (“Delaware”), excluding any conflicts or choice of law rule or principle that might otherwise refer construction or interpretation of this Agreement to the substantive law of another jurisdiction.

9.8    Mediation.

(a)    The Parties shall first attempt to resolve any dispute, controversy or claim arising out of or related to this Agreement (“Dispute”) by confidential mediation in accordance with the then current mediation procedure (“CPR Mediation Procedure”) of the International Institute for Conflict Prevention and Resolution (www.cpradr.org) before initiating litigation. The CPR Mediation Procedure shall control, except where it conflicts with this Section 9.8, in which case this Section 9.8 shall control. The mediator shall be chosen pursuant to the CPR Mediation Procedure. The mediation shall be held in New York, New York. All aspects of the mediation shall be treated as confidential.

(b)    Either Party may initiate mediation by written notice to the other Party of the existence of a Dispute. The Parties shall select a mediator within 20 days of the notice and the mediation will begin promptly after the selection. The mediation will continue until the mediator, or either Party, declares in writing, no sooner than after the conclusion of one full day of a substantive mediation conference attended on behalf of each Party by a senior business person with authority to resolve the Dispute, that the Dispute cannot be resolved by mediation. In no event, however, shall mediation continue for more than 60 days from initial notice by a Party to initiate meditation, unless the Parties agree in writing to extend that period.

(c)    Any period or statute of limitations that would otherwise expire between the initiation of mediation and its conclusion shall be extended until 20 days after the conclusion of the mediation.

(d)    Either Party has the right to seek from the appropriate court provisional remedies such as attachment, preliminary injunction, replevin, etc. to avoid irreparable harm, maintain the status quo, or preserve the subject matter of the Dispute.

(e)    Notwithstanding anything to the contrary in this Agreement, the foregoing provisions of this Section 9.8 shall not apply to any Dispute related to the failure of either Party to perform

21

its obligations required to be performed prior to the Closing pursuant to this Agreement (including failing to take such actions as are required of them hereunder to consummate the Closing) in accordance with its specified terms, and instead the provisions of Section 9.9 shall apply to any such Dispute.

9.9    Dispute Resolution.

(a)    If the Parties fail to resolve any applicable Dispute in mediation or if Section 9.8(e) applies, and a Party desires to pursue resolution of the applicable Dispute, such Dispute may be submitted by such Party for resolution exclusively in the Delaware Court of Chancery in the State of Delaware and any appellate court therefrom and, if such courts do not have jurisdiction, the United States District Court for the District of Delaware sitting in New Castle County, Delaware. Each of the Parties (i) consents to the exclusive jurisdiction of each such court with respect to resolution of such Dispute, (ii) waives any objection that it may have to the laying of venue in any such suit, action or proceeding in any such court, and (iii) agrees that service of any court paper may be made in such manner as may be provided under applicable laws or court rules governing service of process or by registered mail to such Party’s address set forth in Section 9.1.

(b)    The Parties agree to seek an early conference with the court and to advise the court of this Agreement. The Parties agree to make all filings required by the court on a schedule that will assure trial ready status eight months after the service of the first complaint and further agree to make all motions, including motions for summary judgment, on a schedule that will allow them to be fully considered by the court less than eight months after the service of the first complaint.

(c)    Both Parties agree to conduct discovery in a manner and on a schedule to assure completion of discovery within five months after service of the first complaint. To that end, each of the Parties agrees to pursue no more than the following discovery in the aggregate from all parties and non-parties to the action: a total of no more than 20 requests for documents (including subparts); a total of no more than 20 interrogatories (including subparts); and a total of no more than 40 hours of deposition testimony from all witnesses in the aggregate, including both fact and expert witnesses. The Parties agree to work together to reach agreement to limit discovery of electronically stored information, including the use of date restrictions and file types. To obtain email, the parties to the Dispute must propound specific email production requests directed to specific issues, rather than general discovery. Email production requests shall identify the custodian, search terms, and time frame and be limited to a total of five custodians and five search terms.

(d)    Each Party has the right to pursue provisional relief from any court, such as attachment, preliminary injunction, replevin, etc. to avoid irreparable harm, maintain the status quo, or preserve the subject matter of the Dispute.

9.10    WAIVER OF JURY TRIAL. EACH PARTY, TO THE EXTENT PERMITTED BY APPLICABLE LAW, KNOWINGLY, VOLUNTARILY, AND INTENTIONALLY WAIVES ITS RIGHT TO A TRIAL BY JURY IN ANY ACTION OR OTHER LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT AND THE TRANSACTIONS IT CONTEMPLATES. THIS WAIVER APPLIES TO ANY ACTION OR LEGAL PROCEEDING, WHETHER SOUNDING IN CONTRACT, TORT, OR OTHERWISE.

9.11    Waiver and Non-Exclusion of Remedies.

(a)    Any term or condition of this Agreement may be waived at any time by the Party that is entitled to the benefit thereof, but no such waiver shall be effective unless set forth in a written instrument duly executed by or on behalf of the Party waiving such term or condition. The waiver by either

22

Party hereto of any right hereunder or of the failure to perform or of a breach by the other Party shall not be deemed a waiver of any other right hereunder or of any other breach or failure by such other Party whether of a similar nature or otherwise, and nothing in this Agreement shall be deemed a waiver by any Party of any right to specific performance or injunctive relief. The rights and remedies provided herein are cumulative and do not exclude any other right or remedy provided by applicable Law or otherwise available except as expressly set forth herein.

(b)    The Parties agree that irreparable harm would occur in the event that the Closing is not consummated in accordance with the terms of this Agreement, and that money damages or other legal remedies would not be an adequate remedy for any such harm. Accordingly, the Parties acknowledge and hereby covenant and agree that in the event of any breach or threatened breach of the covenants, agreements or obligations set forth in this Agreement, then in addition to any other remedy available at law or in equity, the non-breaching Party will be entitled to an injunction or injunctions to prevent or restrain any breaches or threatened breaches of this Agreement, and to specifically enforce the terms and provisions of this Agreement to enforce compliance with the covenants, agreements and obligations under this Agreement. Each Party hereby covenants and agrees not to raise, and irrevocably waives, any objections to the availability of such relief that a remedy at law would be adequate and that a bond or other security will be required.

9.12    No Benefit to Third Parties. Except as provided in Article 8, the covenants and agreements set forth in this Agreement are for the sole benefit of the Parties and their successors and permitted assigns, and they shall not be construed as conferring any rights on any other Persons.

9.13    Counterparts; Execution. This Agreement may be executed in two (2) or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one (1) and the same instrument. This Agreement may be executed by electronically transmitted signatures and such signatures shall be deemed to bind each Party hereto as if they were original signatures.

[SIGNATURE PAGE FOLLOWS]

23

IN WITNESS WHEREOF, each of Buyer and Seller has caused this Agreement to be executed and delivered by their respective officers thereunto duly authorized, all as of the date first written above.

(SIGNATURE PAGE TO ASSET PURCHASE AGREEMENT)

IN WITNESS WHEREOF, each of Buyer and Seller has caused this Agreement to be executed and delivered by their respective officers thereunto duly authorized, all as of the date first written above.

(SIGNATURE PAGE TO ASSET PURCHASE AGREEMENT)

Exhibit A

Approval Letters

[REDACTED]

Exhibit 2.5(a)

Form of Bill of Sale

[REDACTED]

Exhibit 2.5(b)(i)

Form of Seller Transfer Acknowledgment Letter

[REDACTED]

Exhibit 2.5(b)(ii)

Form of Joint Notification Letter

[REDACTED]

Exhibit 2.5(c)

Form of Seller Closing Certificate

[REDACTED]

Exhibit 2.5(d)

Form of Seller Secretary’s Certificate

[REDACTED]

Exhibit 2.6(c)

Form of Buyer Transfer Acknowledgment Letter

[REDACTED]

Exhibit 2.6(d)

Form of Buyer Closing Certificate

[REDACTED]

Exhibit 5.6

Form of Press Release

[REDACTED]