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3,3'-[1,1'-Biphenyl-4,4'-diylbis(azo)]bis[6-ethylamino-4-hydroxynaphthalene-2-sulfonic acid sodium] salt Structure

3,3'-[1,1'-Biphenyl-4,4'-diylbis(azo)]bis[6-ethylamino-4-hydroxynaphthalene-2-sulfonic acid sodium] salt