3,3'-((3-Carboxy-4-(methylimino)-2,5-cyclohexadien-1-ylidene)methylene)bis(6-(methylamino)benzoic) acid;5-[(E)-(3-carboxy-4-methylamino-phenyl)-(3-carboxy-4-methylimino-1-cyclohexa-2,5-dienylidene)methyl]-2-methylamino-benzoic acid
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