Patent ID: 7084162

Claim:
A compound having the structure amino ester (a) or amino acid (b) wherein PG is a carboxylic acid protecting group which is methyl, ethyl or t-butyl, and wherein X 1 x is an alkylene chain of two carbons, alkenylene chain of two carbons or an alkynylene chain of two carbons; X 1 m is an alkylene chain of one carbon; and X 1 n is an alkylene chain of one carbon; Q is C; A is O; R 1 is methyl; X is CH; R 2 is H, alkyl, alkoxy, halogen, amino or substituted amino; R 2a , R 2b and R 2c are each H; or stereoisomers thereof, or a prodrug ester thereof, and pharmaceutically acceptable salt thereof.