Patent ID: 7115652

Claim:
An isolated compound having the structure: or pharmaceutically acceptable derivative thereof; wherein R 1 is an aliphatic, heteroaliphatic, aromatic or heteroaromatic moiety, or R 1 , taken together with R′, may form a cycloheteroaliphatic moiety; R 2 is an aliphatic, heteroaliphatic, aromatic or heteroaromatic moiety, or R 2 , taken together with R′, may form a cycloheteroaliphatic moiety; R 4 is hydrogen, an aliphatic, heteroaliphatic, aromatic or heteroaromatic moiety, or R 4 , taken together with a substituent present on X 2 or X 3 , may form a cycloaliphatic, cycloheteroaliphatic, aromatic, or heteroaromatic moiety; and R X2A is hydrogen or an aliphatic, heteroaliphatic, aryl, heteroaryl, -(alkyl)aryl, -(alkyl)heteroaryl, -(heteroalkyl)aryl, or -(heteroalkyl)heteroaryl moiety; wherein at least one of R 1 , R 2 , R X2A and R 4 comprises a cycloheteroaliphatic or heteroaromatic moiety.