Patent ID: 8143303

Claim:
A compound of formula (I), or a pharmaceutically acceptable salt thereof wherein: ‘----’ dashed line represents an optional double bond; Ar represents any one group selected from the group consisting of phenyl, naphthyl, monocyclic and bicyclic heteroaryl, each of which may be further substituted by one or more independent substituents defined as R 1 ; R 1 represents one or multiple substitutions on a benzene ring wherein when there are multiple substituents, R 1 are the same or different, R 1 is selected from hydrogen, halogen, cyano, (C 1 -C 3 )alkyl, halo(C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, halo(C 1 -C 3 )alkoxy, cyclo(C 3 -C 6 )alkyl and cyclo(C 3 -C 6 )alkoxy; R represents either hydrogen or (C 1 -C 3 )alkyl; n represents 1 or 2; or a pharmaceutically acceptable salt or stereoisomer thereof.