Patent ID: 7897615

Claim:
A compound represented by structural formula (I): wherein R 1 and R 2 are independently hydrogen, hydroxyl, alkoxyl, phenoxyl, substituted phenoxyl, substituted C 1 -C 12 alkyl, substituted C 2 -C 12 alkenyl, substituted C 2 -C 12 alkynyl, phenyl, substituted phenyl, aryl, or heteroaryl, or R 1 and R 2 together form a 5 to 7 membered ring; R 3 is hydrogen, C 1 -C 12 alkyl, substituted C 1 -C 12 alkyl, phenyl, substituted phenyl, aryl, or heteroaryl; X is C or N; Y is S or O; its corresponding enantiomers, diastereoisomers or tautomers, or a pharmaceutically acceptable salt, or a prodrug thereof.