(benzyl)[4-[[4-[(benzyl)ethylammonio]phenyl](2,4-disulphonatophenyl)methylene]cyclohexa-2,5-dien-1-ylidene](ethyl)ammonium;N-[4-[(2-Sulfonato-4-sulfophenyl)[4-[ethyl(phenylmethyl)amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-ethylbenzenemethanaminium
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