Patent ID: 7238700

Claim:
A compound of the formula: wherein: R 1 is optionally substituted alkyl; R 2 is hydrogen, acyl, or optionally substituted alkyl; R 3 is —Y-Z 1 , in which Y is a covalent bond or optionally substituted alkylene, and Z 1 is optionally substituted phenyl; R 4 and R 6 are independently hydrogen, optionally substituted aryl, or optionally substituted alkyl; R 5 is hydrogen, optionally substituted alkyl, halo, CF 3 , nitro, cyano, optionally substituted alkoxy, optionally substituted thioalkoxy, optionally substituted amino, optionally substituted sulfoxide, optionally substituted sulfone, optionally substituted sulfonamide, optionally substituted acylamino, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, or optionally substituted heterocyclyl; and X is NH—, or a pharmaceutically acceptable salt, ester, or prodrug thereof.