Patent ID: 7495000

Claim:
A compound of general formula (5a): wherein R 1 is selected from the group consisting of OH, OR′, SH, SR′, SOR′, SO 2 R′, NO 2 , NH 2 , NHR′, N(R′) 2 , NHCOR′, NHSO 2 R′, CN, halogen, C(═O)H, C(═O)R′, CO 2 H, CO 2 R′, carboxyalkyl, C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl and substituted or unsubstituted heteroaromatic; wherein X 1 , X 2 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are each independently selected from the group consisting of H, OH, OR′, SH, SR′, SOR′, SO 2 R′, NO 2 , NH 2 , NHR′, N(R′) 2 , NHCOR′, NHSO 2 R′, CN, halogen, C(═O)H, C(═O)R′, CO 2 H, CO 2 R′, carboxyalkyl, C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl and substituted or unsubstituted heteroaromatic; wherein each of the R′ groups is independently selected from the group consisting of H, OH, SH, NO 2 , NH 2 , CN, halogen, C(═O)H, C(═O)CH 3 , CO 2 H, CO 2 CH 3 , C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, aryl, aralkyl and heteroaromatic; wherein the pairs of groups R 1 and R 2 may be joined into a fused benzene ring system; or a pharmaceutically acceptable salt thereof.