Patent ID: 8314239

Claim:
A compound of Formula I or pharmaceutically acceptable salts thereof, wherein: ring A is selected from: wherein: R 1 is —CH 3 , —CF 3 or —CN; R 2 is hydrogen, —CH 3 , —CF 3 , —OH, or —CH 2 OH; R 3 is hydrogen, —CH 3 , —OCH 3 , or —CN; R a is hydrogen or a silyl protecting group selected from the group consisting of trimethylsilyl (TMS), tert-butyldiphenylsilyl (TBDPS), tert-butyldimethylsilyl (TBDMS) triisopropylsilyl (TIPS), and [2-(trimethylsilyl)ethoxy]methyl (SEM); provided that both R 2 and R 3 are not simultaneously hydrogen; and one of X and Y is nitrogen and the other is carbon.