Synonyms: 5,5'-Azobis(2-((4-hydroxy-6-((3-sulfophenyl)amino)-2-sulfonaphth-3-yl)azo)phenol), complex with copper and ammonia, ammonium sodium salt;5,5'-Azobis(2-((4-hydroxy-6-((3-sulfophenyl)amino)-2-sulfonaphth-3-yl)azo)phenol), complex with copper, ammonium sodium salt;Cuprate(4-), (mu-((3,3'-(1,2-diazenediylbis((2-hydroxy-4,1-phenylene)-2,1-diazenediyl))bis(4-hydroxy-6-((3-sulfophenyl)amino)-2-naphthalenesulfonato))(8-)))di-, ammonium sodium;Cuprate(4-), (mu-((3,3'-(azobis((2-hydroxy-4,1-phenylene)azo))bis(4-hydroxy-6-((3-sulfophenyl)amino)-2-naphthalenesulfonato))(8-)))di-, ammonium sodium