Patent ID: 7319096

Claim:
A compound according to formula I: or a salt, stereoisomers, or prodrug ester forms thereof, wherein: R 1 is selected from: C 6-10 aryl; C 5-10 heteroaryl; and C 5-10 cycloalkyl, said aryl, heteroaryl, and cycloalkyl being optionally substituted with 1 to 3 groups R a ; R 2 and R 3 are the same or different and are selected from: chlorine, bromine, C 1-4 alkyl, C 3-4 cycloalkyl, C 2-4 alkenyl, and C 2-4 alkynyl; R 4 is selected from: halogen, —OH, —SH, —NH 2 , and —NH(C 1-4 ); R 5 is selected from: —CO 2 H, —PO(OH) 2 , —PO(OH)NH 2 , —SO 2 OH, COCO 2 H, and —CONHOH; R a is selected from: hydrogen, halogen, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C 1-4 alkoxy, C 1-4 alkylthio, —CN, —NO 2 , NH 2 , —NH(C 1-4 ), and —N(C 1-4 ) 2 ; n is 1 or 2; all the possible steroisomers thereof, and prodrug ester forms thereof.