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tetrahydrogen [3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]-7-nitronaphthalene-1-sulphonato(3-)][3-hydroxy-4-[(2-hydroxy-6-sulpho-1-naphthyl)azo]-7-nitronaphthalene-1-sulphonato(4-)]chromate(4-) related products: