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(3Z)-5-{(E)-[(3Z)-6-hydroxy-4-oxo-3-{2-[4-(phenylamino)-3-sulfophenyl]hydrazinylidene}cyclohexa-1,5-dien-1-yl]diazenyl}-3-[2-(4-nitrophenyl)hydrazinylidene]-4-oxo-3,4-dihydronaphthalene-2,7-disulfonic related products: