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4,4'-[Methylenebis[(2,5-dimethyl-4,1-phenylene)azo]]bis[3-hydroxynaphthalene-2,7-disulfonic acid disodium] salt Structure

4,4'-[Methylenebis[(2,5-dimethyl-4,1-phenylene)azo]]bis[3-hydroxynaphthalene-2,7-disulfonic acid disodium] salt