definiens: means, on a country - by - co untry and Product - by - Product basis, the period beginning on the First Commercial Sale of such Prod uct in such country and continuing until ( a ) with respect to the Existing Product, the expiration of the last - to - expire Valid Claim of the Patent Rights set forth on Schedule 1.158 that claims the Existing Pr oduct, ( b ) with respect to MD-7246, the expiration of the last - to - expire Valid Claim of the Patent Rights set forth on Schedule 1.109 that claims MD-7246 an d any Ironwood Patent Right or Joint Patent Right tha t claims the formulation of MD-7246 or its use and ( c ) with respect to any Product other than the Exis ting Product or MD-7246, the Composition of Matter Patent and any Ironwood Patent Right or Joint Paten t Right that claims the formulation of such Product or its use ( including, in each case ( ( a)-(c ) ), with respect to such Patent Rights, ( i ) all provisional applications, substitutions, continuations, continu ations - in - part, divisions, renewals, and all patent s granted thereon, ( ii ) reissues, reexaminations and extensions or restorations by existing or future extension or restoration mechanisms, including supp lementary protection certificates or the equivalent thereof, and ( iii ) any other form of government - iss ued right substantially similar to any of the foreg oing )