definiens: means, with respect to each Licensed Product and each country in the Territory, the period beginning on the date of the First Commercial Sale of such Licensed Product in such country, and ending on the later to occur of ( a ) the expiration, in validation or abandonment date of the last Licensor Background Patent, Licensor Program Patent, a Denali Program Patent or Joint Program Patent that includes a Valid Claim that claims or covers the manufacture, sale, or use ( provided such use is the subjec t of a Regulatory Approval obtained by or on behalf or Denali, its Affiliates or Sublicensees or Distributors of the mAb2 or Licensed Product of such Licensed Product in such country ) of such Licensed Product in such country, ( b ) the expiration of Regulato ry Exclusivity for such Licensed Product in such country ; and ( c ) the twelfth ( 12th ) anniversary of the First Commercial Sale of such Licensed Product in such country