Synonyms: Cuprate(4-), (mu-((4-((6-((3,3'-dihydroxy-4'-((1-hydroxy-3,8-disulfo-2-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-5-hydroxy-7-sulfo-2-naphthalenyl)amino)phenoxy)acetato(8-)))di-, tetrasodium;Tetrasodium (mu-((4-((6-((3,3'-dihydroxy-4'-((1-hydroxy-3,8-disulpho-2-naphthyl)azo)(1,1'-biphenyl)-4-yl)azo)-5-hydroxy-7-sulpho-2-naphthyl)amino)phenoxy)acetato(8-)))dicuprate(4-)