Patent ID: RE41614

Claim:
Compounds having the formula: wherein each of the groups X 1 , X 2 , R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 and R 9 is independently selected from the group consisting of H, OH, OR′, SR′, SOR′, SO 2 R′, NO 2 , NH 2 , NHR′, N(R′) 2 , NHC(O)R′ NHC( ═O ) R′ , CN, halogen, ═O, C(═O)H, C(═O)R′, CO 2 H, CO 2 R′, 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, NH 2 , NO 2 , SH, CN, halogen, ═O, C(═O)H, C═O)CH 3 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 each dotted circle represents one, two or three optional double bonds; and wherein R 7 and R 8 may be are joined into a carbocyclic or heterocyclic ring system.