definiens: means, with respect to a Licensed Product being sold in aparticular country or territory in the Licensed Territory, on a Licensed Product - by - LicensedProduct and a country - by - country basis, the period commencing on First Commercial Sale of theLicensed Product in such country or territory, and ending on the latest to occur of : ( a ) theexpiration of the last Valid Claim within the Licensed Patent Rights that Covers ( i ) thecomposition of matter of the Compound or Licensed Product in such country, or ( ii ) a method ofuse of the Compound for which Licensed Product has obtained a Regulatory Approval in suchcountry, ( b ) expiration of marketing or regulatory exclusivity in such country in the Territory, or ( c)the tenth ( 10th ) anniversary of the date of the First Commercial Sale by VFMCRP or any of itsAffiliates or Sublicensees of such Licensed Product in such country