Patent ID: 7705004

Claim:
A compound having the following structure (I): or a pharmaceutically acceptable salt thereof, wherein R 1 is structure (a), (b), (c) or (d): R a and R b are independently hydrogen, halogen, alkyl, aryl, heterocycle, —CN, —NO 2 , —OR, —SR, —NRR, —C(═O)R —C(═O)OR, —NHC(═O)OR, or —SO 2 NRR; and R c is hydrogen, alkyl, —S(O)R or —(SO 2 )R; R is, at each occurrence, independently hydrogen, alkyl, or aryl; R 2 is hydrogen or alkyl; R 3 is optionally substituted aryl or optionally substituted heterocycle; R 4 is hydrogen or alkyl; R 5 is hydrogen or lower alkyl; and R 6 and R 7 are independently hydrogen, halogen, cyano, lower alkyl, aryl or heterocycle.