Patent ID: 7265126

Claim:
A compound of the formula I wherein A-B is CH 2 —CH 2 , —CH 2 —O—, —O—CH 2 —, —CH 2 —S—, —S—CH 2 —, —CH 2 —C(O)—, —C(O)—CH 2 —, —N(R 4 )—CH 2 — or —CH 2 —N(R 4 )—; R 1 is lower alkyl, lower alkenyl, cycloalkyl, or is aryl, optionally substituted by one or two substituents selected from the group consisting of halogen, cyano, lower alkyl, CF 3 , OCF 3 and lower alkoxy, or is heteroaryl, optionally substituted by one or two substituents selected from the group consisting of halogen, lower alkyl, CF 3 and lower alkoxy; R 2 is lower alkyl, cycloalkyl, or is aryl, optionally substituted by one or two substituents selected from the group consisting of halogen, lower alkyl, CF 3 , and lower alkoxy, or is heteroaryl, optionally substituted by one or two substituents selected from the group consisting of halogen, lower alkyl, CF 3 and lower alkoxy; R 3 is hydrogen, lower alkyl or benzyl; R 4 is hydrogen or benzyl; and n is 0, 1 or 2; or a pharmaceutically acceptable salt thereof.