| 1. | Appendix F — Milestones. Appendix F-1 is hereby
                deleted in its entirety and replaced with the following: | 
| Diligence Event | Achievement Date | 
| [***] | [***] | 
| [***] | [***] | 
| [***] | [***] | 
| 2. | Except as expressly set forth in this Amendment No. 4, the License Agreement remains in full force and effect in accordance with its terms. | 
| 3. | This Amendment No. 4 may be executed in counterparts, each of which will be deemed an original, and  all of which together will be deemed to be one and the same instrument. A portable
              document format (PDF) or electronic copy of this Amendment No. 4, including the signature pages, will be deemed an original. The parties hereby agree that this Amendment No. 4 may be executed with electronic signatures and shall be valid and
              binding on the parties to the extent electronically signed. | 
| Licensors: | 
| TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA | 
| By: /s/ Benjamin Dibling, Ph.D. | 
| Name: Benjamin Dibling, Ph.D. | 
| Title: Associate Vice Provost for Research and Managing Director, Penn Center for Innovation | 
| UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INCORPORATED | 
| By:  /s/ Jim O’Connell | 
| Name: Jim O’Connell | 
| Title: Director, UF Innovate | Tech Licensing | 
| Licensee: | 
| OPUS GENETICS INC. | 
| By: /s/ Ben Yerxa | 
| Name: Ben Yerxa | 
| Title: Chief Executive Officer |