Patent ID: 8734534

Claim:
A compound of formula (1) wherein R1 represents hydrogen; substituted or unsubstituted C 1-5 -alkyl; substituted or unsubstituted C 1-5 -alkoxyl; substituted or unsubstituted aryl; substituted or unsubstituted phenyl; p-C 1-5 -alkoxyphenyl; di(C 1-5 -alkyl)amino groups; amino, sulfonic, carboxyl, hydroxyl, halogen, or nitro groups; wherein R1 is attached to the aromatic ring at any position and comprises sulfonic; k is an integer from 1 to 4, r is an integer of 0 or 1; A, C represent, independently of each other, or tautomeric forms wherein D represents C with the proviso that D is not equal to B represents wherein R2, R3, R4, R5, independently of each other, represent hydrogen; substituted or unsubstituted C 1-5 -alkyl; substituted or unsubstituted C 1-5 -alkoxyl; substituted or unsubstituted aryl; substituted or unsubstituted phenyl; p-C 1-5 -alkoxyphenyl; di(C 1-5 -alkyl)amino groups; amino, sulfonic, carboxyl, hydroxyl, halogen, or nitro groups; wherein R2, R3, R4, R5 are attached to the aromatic ring at any position; and wherein R8, R10, and R11, independently of each other, represent hydrogen, substituted or unsubstituted C 1-4 -alkyl, substituted or unsubstituted C 1-4 -alkoxy, substituted or unsubstituted aryl, substituted or unsubstituted phenyl, sulfonic, carboxyl, amino, nitro, hydroxyl, or halogen groups, and X represents O, S, NH, SO 2 , CH═CH, NHCO, NH—CO—NH, N═N, N═N(O); m, s independently of each other, are an integer from 1 to 4; and n, p independently of each other, are an integer from 1 to 3.