Patent ID: 7115777

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof; wherein Y represents the group —C(═X) or SO 2 ; and (i) R 1 and R 2 together form a single bond or methylene; and, if Y represents the group —C(═X), X represents NH, S, or O; or (ii) R 1 represents C 1 –C 7 -alkyl; or represents C 1 –C 7 -alkyl that is substituted by a substitutent selected from the group consisting of amino, carboxy, hydroxy-C 1 –C 7 -alkyl-amino, C 1 –C 7 -alkoxy-C 1 –C 7 -alkyl-amino, and aryl that is unsubstituted or substituted by a substiuent selected from the group consisting of C 1 –C 7 -alkyl, C 1 –C 7 -alkoxy, hydroxy, carboxy, halogen, CF 3 , nitro and cyano; or represents C 1 –C 7 -alkoxy that is unsubstituted or substituted by a substiuent selected from the group consisting of C 1 –C 7 -alkyl, C 1 –C 7 -alkoxy, hydroxy, halogen, CF 3 , nitro and cyano; and R 2 represents hydrogen; and, if Y represents the group —C(═X), X represents NH, S, or O; or (iii) R 1 represents amino; R 2 represents hydrogen; and, if Y represents the group —C(═X), X represents NH; or wherein Y represents the group —C(═X); and (iv) R 1 and R 2 together form a the group —CO—O—; and X represents O.