Patent ID: 6855725

Claim:
A compound of the formula: wherein, R 1 represents hydrogen, (C 1 -C 6 )alkyl, (C 1 -C 6 )alkoxy, (C 3 -C 10 )cycloalkyl, SO 2 R 2 , SR 2 , CH 2 SR 2 , (C 1 -C 6 )alkyl(C 1 -C 6 )alkoxy, aryl, (C 1 -C 6 )alkylaryl, (C 1 -C 6 )alky(substituted)aryl, or substituted aryl; R 2 represents (C 1 -C 6 )alkyl; and X represents CH or N; or a pharmaceutically acceptable salt or prodrug thereof.