97416-93-8

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-)