Patent ID: 7534801

Claim:
A compound of formula I wherein R 1 is halogen, CN, NO 2 , OR 8 , CO 2 R 9 , CONR 10 R 11 or a C 1 -C 6 alkyl; m is 0 or an integer of 1 or 2; R 2 is an optionally substituted phenyl, naphthyl, thienyl or imidazo[2,1-b]thiazolyl group; R 3 and R 4 are each independently H or C 1 -C 6 alkyl; R 5 , R 6 and R 7 are each independently H or C 1 -C 6 alkyl; R 8 is H or a C 1 -C 2 alkyl; R 9 is H or a C 1 -C 6 alkyl; R 10 and R 11 are each independently H or a C 1 -C 6 alkyl; and represents a single bond or a double bond; or a stereoisomer thereof or a pharmaceutically acceptable salt thereof; wherein the substituent groups which are optionally present are selected from the group consisting of hydrogen, halogen atoms, haloalkyl, hydroxyl, lower alkyl, alkoxy and alkylamino groups.