Patent ID: 7407977

Claim:
A compound of the formula or a pharmaceutically acceptable salt thereof, wherein X is —CH 2 —, —CH 2 CH 2 —, —(CH 2 ) 3 — and O(CH 2 )—; R is a 5- or 6- membered saturated or unsaturated carbocyclic or heterocyclic ring which optionally may contain one or more hetero atoms and said rings being optionally substituted with one or more substituents selected from the group consisting of halogen, lower alkyl, acetamidomethyl, alkoxycarbonyl amidomethyl, a nitrile group, a sulfonamido group, alkylsulfonyl, alkoxy, benzyl, benzoyl, arylsulfonyl and acyl which benzyl, benzoyl or arylsulfonyl is optionally substituted by halogen, trihalo lower alkyl, lower alkyl, alkoxy, alkylsulfonyl or cyano; and R 1 is selected from the group consisting of hydrogen, halogen, lower alkyl, alkoxy or a nitrile group.