Patent ID: 7847101

Claim:
A compound of formula (1): as a single tautomer, a mixture of tautomers, a single stereoisomer, a mixture of stereoisomers, or a racemic mixture; or a pharmaceutically acceptable salt thereof; wherein: R 1 at each occurrence is independently selected from amino, aminosulfinyl, aminosulfonyl, aryl, azido, halogen, heteroalkyl, heteroaryl, hydrazinyl, hydrocarbyl, hydrogen, hydroxyl, nitro, nitroso, phosphate, phosphinate, phosphonate, phosphonium, phosphorothioate, phosphoryl, sulfamoyl, sulfate, sulfinic acid, sulfonamido, sulfonate, sulfonic acid, sulfoxido, thiol, thioureido, and ureido; R 2 is amino, aminosulfinyl, aminosulfonyl, azido, halogen, heteroaryl, hydrazinyl, hydroxyl, nitro, nitroso, phosphate, phosphinate, phosphonate, phosphonium, phosphorothioate, phosphoryl, sulfamoyl, sulfate, sulfinic acid, sulfonamido, sulfonate, sulfonic acid, sulfoxido, thiol, thioureido, or ureido; R 3 is selected from heterocycle, halogen-substituted hydrocarbyl and hydrocarbyl; and R 4 is selected from hydrogen, heteroalkyl, heteroaryl, and hydrocarbyl.