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6,6'-[1,1'-Biphenyl-4,4'-diylbis(azo)]bis(4-amino-5-hydroxynaphthalene-1,7-disulfonic acid disodium) salt Structure

6,6'-[1,1'-Biphenyl-4,4'-diylbis(azo)]bis(4-amino-5-hydroxynaphthalene-1,7-disulfonic acid disodium) salt