Patent ID: 7371766

Claim:
A compound of the formula wherein: one of X 1 and X 2 is nitrogen and the other is carbon, wherein each carbon atom of the heteroaryl rings is optionally substituted with a substituent selected from the group consisting of halogen, hydroxyl, alkoxy, CF 3 , alkyl, substituted alkyl, alkenyl, alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, alkaryl, arylalkyl, heteroaryl, substituted heteroaryl, heterocycle, substituted heterocycle, amino, alkylamino, dialkylamino, a carboxylic acid group, a carboxylic ester group, a carboxamide group, nitro, cyano, azide, alkylcarbonyl, acyl, and trialkylammonium; A is selected from the group consisting of: wherein X 3 is O, S, SO, SO 2 , or NR 1 ; and R 1 is selected from the group consisting of aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocycle, substituted heterocycle, acyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, and dialkylaminocarbonyl; the dashed lines indicate the presence of optional double bonds; L is the point of bonding of A to the compound structure; or a pharmaceutically acceptable salt thereof.