Collaboration Agreement, by and between Enea Angelo Trevisan and Ealixir Hispania, S.L.U, dated December 27, 2021

Exhibit 10.15

Pursuant to Item 601(b)(10)(iv) of Regulation S-K, certain identified information marked with [*****] has been excluded from the exhibit because it is both (i) not material and (ii) the type that the registrant treats as private or confidential.

COLLABORATION AGREEMENT

BETWEEN

ELAB HISPANIA SLU

And

Enea Angelo TREVISAN

Identity document [*****]

Fiscal code [*****]

Born in [*****]

Place of Residence – Country [*****]

Domicile in Italy [*****]

Telephone [*****]

(hereinafter referred to as the

“Contributor”). Jointly “the Parties”.

PREMISES

In view of the above, the Parties sign the following agreements:

ARTICLE 1 - PURPOSE OF THE AGREEMENT

The above must be organized in collaboration with the management, also through the use of the specific company structures as well as the information and data in possession of the Client’s offices.

For the purpose of coordinating the above activity, there must be a constant exchange of information regarding the performance of the assignment and for compliance with the agreed deadlines.

ARTICLE 2 - DURATION AND EARLY TERMINATION

ARTICLE 3 - REPRESENTATIONS AND WARRANTIES

The Collaboration covered by this contract is provided by the Collaborator in the context of a relationship which, given the methods of execution and by the explicit will of the parties, must be considered, to all intents and purposes, an autonomous performance relationship for the implementation of a specific work project.

This relationship will therefore not have any character of a subordinate employment relationship but will entail, in the implementation of the task entrusted to him and in the implementation of the project, referred to in point 1, the Collaborator operating independently, in the manner he deems most appropriate, in total freedom to carry out the assignment, without any subordination bond and without hierarchical subjection, disciplinary and working hours, while maintaining constant coordination in terms of objectives and results.

The Collaborator undertakes to carry out the above assignment on a continuous basis with the use of his/her personal skills, not being able to delegate, in whole or in part, the execution of the task entrusted to him, and without the assumption of any other commitments, subsequent in time, causing situations of non-compliance with what has been agreed herein.

The Parties agree on the common desire to confirm, in every appropriate forum, the character of self-employment as regulated herein, since there is no interest on the part of the contracting parties to establish a relationship of a different nature from the one that is agreed upon here.

The Collaborator declares and warrants that:

ARTICLE 4 – COMPENSATION

The company will pay the Collaborator a monthly fee of € 1,000.00. The reimbursement of any expenses incurred by the Collaborator for the provision of the requested services will be admissible only after prior approval by the Client.

ARTICLE 5 – NON-COMPETE AGREEMENT

ARTICLE 6 – CONFIDENTIALITY, NON-DISCLOSURE AND CONFIDENTIALITY AGREEMENT

ARTICLE 7 – AMENDMENTS – ASSIGNMENTS – COMMUNICATIONS

The provisions of this contract may not be modified unless such changes are agreed in writing and signed by the Collaborator and the Client. The Collaborator may not assign or delegate to third parties his/her obligations arising from this contract. The Client may assign this contract to its subsidiaries, in which case the assignment is hereby accepted by the Collaborator. Any communication pursuant to this contract must be made in writing, including by email, addressed

to the last known address or domicile or registered office (referred to in Article 9 below).

ARTICLE 8 – CORRESPONDENCE

Rambla de Catalunya, 62

08007 Barcelona – SPAIN

Email: [*****]

Enea Angelo TREVISAN

[*****], [*****] Milan

Email: [*****]

ARTICLE 9 – APPLICABLE LAW AND ARBITRATION CLAUSE

Read, confirmed and subscribed

ealixir.com