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6'-Amino-1'-hydroxy-4-[(2-methylphenyl)azo]-[1,2'-azobisnaphthalene]-3',6-disulfonic acid disodium salt Structure

6'-Amino-1'-hydroxy-4-[(2-methylphenyl)azo]-[1,2'-azobisnaphthalene]-3',6-disulfonic acid disodium salt