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4-[(2E)-2-{6-[({(6E)-6-[2-(4-carboxy-2-methoxyphenyl)hydrazinylidene]-5-oxo-7-sulfo-5,6-dihydronaphthalen-2-yl}carbamoyl)amino]-1-oxo-3-sulfonaphthalen-2(1H)-ylidene}hydrazinyl]-3-methoxybenzoic acid related products: