Patent ID: 7563797

Claim:
A compound of formula I: wherein R 1 is aryl or heteroaryl; R 2 , R 3 and R 4 are each independently hydrogen, halogen, hydroxyl, cyano, nitro, amino, alkylamino, dialkylamino, carboxyl, alkyl, halogenated alkyl, alkenyl, alkynyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocycle, heterocyclealkyl, cycloalkyl, aroyl, acyl, alkoxy, aryloxy, alkythio, arylthio, alkoxycarbonyl, aryloxycarbonyl, or —C(O)NR 5 R 6 , wherein at least one of R 2 and R 3 is —C(O)NR 5 R 6 ; R 5 and R 6 are each independently hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroaryl, heterocycle, or heterocyclealkyl; and pharmaceutically acceptable salts thereof.