Patent ID: 7423170

Claim:
A compound of Formula IIA′: A—O—(C═O)—CX 1 X 2 X 3 (Formula IIA′) wherein A is selected from the group consisting of wherein n is an integer from 0 to about 10; and X 1, X 2, and X 3 are independently selected from the group consisting of hydrogen, halogen, organosulfonyloxy, bromobenzenesulfonyloxy, methanesulfonyloxy, trifluoromethanesulfonyloxy, acyloxy, aryloxy, imidazolyl, —O—N═O, —NO 2 , —OSO 3 − , and —OPO 2 (OH) − , with the proviso that X 1, X 2, and X 3 are not all hydrogen, or a pharmaceutically acceptable salt, prodrug, or ester thereof.