Patent ID: 7579479

Claim:
A compound having the structure wherein PG in amino ester (a) and carbamoyl chloride (c) is a carboxylic acid protecting group, and wherein X 1 x is an alkylene chain of 1 to 4 carbons, an alkenylene chain of 2 to 4 carbons or an alkynylene chain of 2 to 4 carbons; X 1 m is an alkylene chain of 1 or 2 carbons, an alkenylene chain of 2 carbons or an alkynylene chain of 2 carbons; X 1 n is an alkylene chain of 1 or 2 carbons, an alkenylene chain of 2 carbons or an alkynylene chain of 2 carbons; Q is C; A is O; R 1 is H or lower alkyl; X is CH R 2 is H, alkyl, alkoxy, halogen, amino or substituted amino; R 2a , R 2b and R 2c are the same or different and are selected from H, alkyl alkoxy, halogen, amino or substituted amino; or stereoisomers thereof, or a pharmaceutically acceptable salt thereof.