Patent ID: 8258119

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: wherein, R is selected from the group consisting of H, CH 3 , and CH 2 OH; R 1 is selected from the group consisting of OH, NHR 4 , NR 4 R 5 , and SH; R 2 and R 3 are independently selected from the group consisting of H, N═N—N(CH 3 ) 2 , N═N—NHCH 3 , N═N—N(CH 3 )CH 2 OH, CONHR 4 , CONR 4 R 5 , CONHNH 2 , CONHNHR 4 , CONHNR 4 R 5 , COOCH 3 , COOCH 2 CH 3 , COOH, COSH, CN, C≡CH, SO 2 NH 2 , SO 2 NHR 4 , SO 2 NR 4 R 5 , SO 3 H, SO 2 CH 3 , SO 2 CH 2 CH 2 NH 2 , NHCH 2 COOH, NHCH(CH 3 )COOH, NO 2 , CF 3 , Cl, Br, F, I, CCl 3 , Ph (C 6 5 ), CH 3 , C 2 H 5 , n-C 3 H 7 , iso-C 3 H 7 , n-C 4 H 9 , iso-C 4 H 9 , tert-C 4 H 9 , OH, OCH 3 , NH 2 , and NHCH 3 ; R 4 and R 5 are independently selected from the group consisting of H, C 1 -C 10 alkyl, alkenyl, alkylol, and alkylamine; and X, Y, and Z are independently selected from the group consisting of C, N, O, and S, with the proviso that the resulting five membered ring is a substituted or unsubstituted ring selected from the group consisting of thiophene, furan, thiazole, isothiazole, and furazole.