Patent ID: 7276607

Claim:
A compound of the formula I: wherein: n is 0; bond a may be single or double, but is single when n is 1; Ar 1 represents phenyl or thienyl, any of which optionally bears up to 3 substituents independently selected from halogen, OR 5 , C 1-6 alkyl and C 1-6 alkyl-phenyl; R 1 represents C 1-6 alkyl; R 2 and R 3 complete a piperidine, quinoline, tetrahydropyridine or tetrahydroisoquinoline ring, wherein the ring is optionally substituted with up to 3 substituents independently selected from halogen, CN, NO 2 , CF 3 , C 1-6 alkyl, C 3-7 cycloalkyl, phenyl, OR 5 , N(R 5 ) 2 , CO 2 R 5 , COR 5 and CON(R 5 ) 2 ; R 5 represents H or C 1-4 alkyl which is optionally substituted with halogen, phenyl, CF 3 , OH, C 1-4 alkoxy, C 1-4 alkoxycarbonyl, amino, C 1-4 alkylamino or di(C 1-4 alkyl) amino; or a pharmaceutically acceptable salt thereof.