Patent ID: RE39663

Claim:
A compound having the formula: wherein: at least one of R 1 , R 2 , R 3 , R 4 , R 5 , or R 7 is an electron-deficient nitrogen heterocycle; R 1 , when taken alone, is H, F, Cl, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) substituted alkyl, (C 1 -C 6 ) alkoxy, sulfonate, sulfone, amino, imminium, amido, nitrile, reactive linking group, phenyl, substituted phenyl, aryl, substituted aryl, or heterocycle, or when taken together with R 7 is benzo or heterocycle; R 2 , when taken alone, is H, F, Cl, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) substituted alkyl, (C 1 -C 6 ) alkoxy, sulfonate, sulfone, amino, imminium, amido, nitrile, reactive linking group, phenyl, substituted phenyl, aryl, substituted aryl, or heterocycle; R 3 , when taken alone, is H, F, Cl, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) substituted alkyl, (C 1 -C 6 ) alkoxy, sulfonate, sulfone, amino, imminium, amido, nitrile, reactive linking group, phenyl, substituted phenyl, aryl, substituted aryl, or heterocycle; R 4 , when taken alone, is H, F, Cl, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) substituted alkyl, (C 1 -C 6 ) alkoxy, sulfonate, sulfone, amino, imminium, amido, nitrile, reactive linking group, phenyl, substituted phenyl, aryl, substituted aryl, or heterocycle, or when taken together with R 5 is benzo or heterocycle; R 5 , when taken alone, is H, F, Cl, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) substituted alkyl, (C 1 -C 6 ) alkoxy, sulfonate, sulfone, amino, imminium, amido, nitrile, reactive linking group, phenyl, substituted phenyl, aryl, substituted aryl, or heterocycle, or when taken together with R 4 is benzo or heterocycle; R 7 , when taken alone, is H, F, Cl, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) substituted alkyl, (C 1 -C 6 ) alkoxy, sulfonate, sulfone, amino, imminium, amido, nitrile, reactive linking group, phenyl, substituted phenyl, aryl, substituted aryl, or heterocycle, or when taken together with R 1 is benzo or heterocycle; and R 6 is selected from the group consisting of (C 1 -C 6 ) alkyl, (C 2 -C 6 ) alkene, (C 2 -C 6 ) alkyne, cyano, heterocyclic aromatic, phenyl, and substituted phenyl having the structure: wherein X 1 , X 2 , X 3 , X 4 and X 5 taken separately are H, Cl, F, (C 1 -C 6 ) alkyl, (C 2 -C 6 ) alkene, (C 2 -C 6 ) alkyne, CO 2 H, SO 3 H, CH 2 OH, or reactive linking group.