Synonyms: Cuprate(4-), (mu-((5,5'-(carbonylbis(imino(2-hydroxy-5-sulfo-4,1-phenylene)-2,1-diazenediyl))bis(6-hydroxy-2-naphthalenesulfonato))(8-)))di-, ammonium sodium;2,2'-(Carbonyldiimino)bis(4-hydroxy-5-((2-hydroxy-6-sulfonaphth-1-yl)azo)benzenesulfonic acid), copper complex, ammonium sodium salt;Cuprate(4-), (mu-((5,5'-(carbonylbis(imino(2-hydroxy-5-sulfo-4,1-phenylene)azo))bis(6-hydroxy-2-naphthalenesulfonato))(8-)))di-, ammonium sodium