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1,8'-Dihydroxy-7-[(2,4-diaminophenyl)azo][2,2'-azobisnaphthalene]-3,6'-disulfonic acid disodium salt Structure

1,8'-Dihydroxy-7-[(2,4-diaminophenyl)azo][2,2'-azobisnaphthalene]-3,6'-disulfonic acid disodium salt