Patent ID: 7868033

Claim:
A compound having the formula: or pharmaceutically acceptable salts, esters, enol ethers, enol esters, acetals, ketals, orthoesters, hemiacetals, hemiketals, hydrates, or prodrugs thereof, wherein: Y is tetrazolyl, CONHOH, B(OH) 2 , CONHSO 2 Ar, CONHCH(R 6 )COOH, or —(CH 2 ) n —C(R 6 )(NH 2 )—COOH; X is O; R 1 , R 2 and R 3 are each independently selected from halo and OH; Ar is aryl, optionally substituted with halo, OR, alkyl or haloalkyl; R is hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl or heteroaryl; R 6 is the side chain of a naturally occurring α-amino carboxylic acid; and n is an integer from 0-3.