3,3'-(((4-((4-Ethoxyphenyl)amino)phenyl)methylene)bis((3-methyl-4,1-phenylene)(ethylimino)methylene))bis(benzenesulphonic) acid;3-[[[4-[[4-[(4-ethoxyphenyl)amino]phenyl]-[4-[ethyl-[(3-sulfophenyl)methyl]amino]-2-methyl-phenyl]methyl]-3-methyl-phenyl]-ethyl-amino]methyl]benzenesulfonic acid
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