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disodium (3Z)-3-[2-(2-methylphenyl)hydrazinylidene]-7-[({(6Z)-6-[2-(2-methylphenyl)hydrazinylidene]-5-oxo-7-sulfonato-5,6-dihydronaphthalen-2-yl}carbamoyl)amino]-4-oxo-3,4-dihydronaphthalene-2-sulfona related products: