Patent ID: 7572919

Claim:
A compound of formula I: wherein X is selected from the group consisting of O, N, S, SO, SO 2 , and S(CH 2 ) n , wherein n=1-10; R 1 and R 2 can be the same or different and are selected from the group consisting of H, OH, OCH 3 , OCH 2 CH 3 , OCH 2 C 6 H 5 , NH 2 , NHCH 3 , N(CH 3 ) 2 , CH 3 , CH 2 CH 3 , CH 2 CH 2 CH 3 , CH(CH 3 ) 2 , C(CH 3 ) 3 , NO 2 , F, Cl, Br, CF 3 , SH, SCH 3 , SCH 2 CH 3 , OCOCH 3 , OCOC(CH 3 ) 3 , OCOCH 2 COOH, and CN; and R 3 comprises a nitrogen-containing heterocyclic ring; or a salt, ester, derivative, or prodrug thereof.