Patent ID: 7834031

Claim:
A compound of the formula: wherein: A is selected from N and CH; R 2a and R 2b are independently selected from the group consisting of: (1) hydrogen, (2) fluoro, (3) chloro, and (4) bromo; R 3 is C 1-6 alkyl, which is unsubstituted or substituted with fluoro; R 4 is selected from the group consisting of: (1) hydrogen, and (2) C 1-3 alkyl; one of X and Y is selected from the group consisting of: (1) 18 F, (2) —O( 11 CH 3 ), and (3) —O(CD 2 18 F), and the other of X and Y is hydrogen; or a pharmaceutically acceptable salt thereof or an individual enantiomer or diastereomer thereof.