Development and Approval Milestones. Subject to the terms of this Agreement (including Section 5.1.3), within ​ days after the first achievement by Allergan, its Affiliates or Sublicensees of a Milestone Event set forth below for Licensed Products, Allergan shall make a one-time, non-creditable, non-refundable Milestone Payment to UroGen in the amount below corresponding to such Milestone Event:

Sales-Based Milestone. In partial consideration of the license rights granted by UroGen to Allergan hereunder and subject to the terms and conditions set forth in this Agreement, the first time that the aggregate Net Sales of all Licensed Products made by Allergan or any of its Affiliates or Sublicensees in the Territory in any Calendar Year exceed ​, Allergan shall pay to UroGen a non-creditable, non-refundable milestone payment in the amount of ​. Such milestone payment shall be due within ​ days after the end of the applicable Calendar Year in which the relevant sales threshold was met.