hexasodium 8,8'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bisnaphthalene-2,3,6-trisulphonate;8,8'-[Carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis(2,3,6-naphthalenetrisulfonic acid trisodium) salt
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