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(3Z)-5-amino-6-{(E)-[4-({4-[(2Z)-2-(4-amino-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]benzoyl}amino)phenyl]diazenyl}-4-oxo-3-(2-phenylhydrazinylidene)-3,4-dihydronaphthalene-2,7-disulfonic acid related products: