| abstract |
This invention relates to a cyanine compound represented by the formula (1) <IMAGE> (1) wherein X is a lower alkoxy, Y is a lower alkyl or a lower alkoxy, R1 is a lower alkyl, or a lower alkyl substituted with at least one of C1-C4 alkoxy, hydroxy, sulfo, carboxy, C1-C4 alkyl amino, acetoxy, C1-C4 alkoxy carbonyl, C1-C4 sodium sulfonate, C1-C4 sodium carboxylate, alkyl amino methyl, acetoxy methyl, and methoxyl carbonyl methyl, and Z- is an anion |