Patent ID: 8012997

Claim:
A compound of the formula: or a pharmaceutically acceptable salt or stereoisomer thereof, wherein: X is CH 2 or C═O; n is 0 or 1; R 1 is C(O)R 3 ; R 2 is H or methyl; and R 3 is: (C 1 -C 8 )alkyl, optionally substituted with one or more substituents selected from a group consisting of halogen, N 3 , —S—(C 1 -C 8 )alkyl, aryl and OH; or aryl, optionally substituted with one or more substituents selected from a group consisting of (C 1 -C 8 )alkyl, —O—(C 1 -C 8 )alkyl, halogen, CF 3 and NO 2 .