Patent ID: 7939330

Claim:
A compound represented by the following general formula (IA): wherein R 21 and R 22 represent amino groups substituting at adjacent positions on the benzene ring, and one of the amino groups may have one alkyl group which may have a substituent; R 23 and R 24 independently represent a hydrogen atom, a C 1-6 alkyl group which may have a substituent, or a C 1-6 alkoxy group which may have a substituent; R 25 , R 26 , R 27 , R 28 , R 29 , R 30 , R 31 , and R 32 independently represent a hydrogen atom, a sulfo group, a phospho group, a halogen atom, or a C 1-6 alkyl group which may have a substituent; R 33 and R 34 independently represent a C 1-18 alkyl group which may have a substituent; Z 21 represents an oxygen atom, a sulfur atom, or —N(R 35 )— wherein R 35 represents a hydrogen atom, or a C 1-6 alkyl group which may have a substituent; Y 21 and Y 22 independently represent —C(═O)—, —C(═S)—, or —C(R 36 )(R 37 )— wherein R 36 and R 37 independently represent a C 1-6 alkyl group which may have a substituent; and M − represents a counter ion in a number required for neutralizing the charge.