Synonyms: Cuprate(2-), .mu.-7,7-iminobis3-5-(aminosulfonyl)-2-(hydroxy-.kappa.O)phenylazo-.kappa.N1-4-(hydroxy-.kappa.O)-2-naphthalenesulfonato(6-)di-, disodium;Cuprate, [μ-[[7,7'-iminobis[3-[[5-(aminosulfonyl)-2-hydroxyphenyl]azo]-4-hydroxy-2-naphthalenesulfonato]]]]di-, disodium;Cuprate(2-), [μ-[[7,7'-iminobis[3-[ [5-(aminosulfonyl)-2-hydroxyphenyl]azo]-4-hydroxy -2-naphthalenesulfonato]](6-)]]di-, disodium;C.I. Direct Violet 66;Cuprate(2-), (mu-((7,7'-iminobis(3-((5-(aminosulfonyl)-2-hydroxyphenyl)azo)-4-hydroxy-2-naphthalenesulfonato))(6-)))di-, disodium;Cuprate(2-), (mu-((7,7'-iminobis(3-(2-(5-(aminosulfonyl)-2-(hydroxy-kappao)phenyl)diazenyl-kappan1)-4-(hydroxy-kappao)-2-naphthalenesulfonato))(6-)))di-, sodium (1:2);Disodium (mu-((7,7'-iminobis(4-hydroxy-3-((2-hydroxy-5-sulphamoylphenyl)azo)naphthalene-2-sulphonato))(6-)))dicuprate(2-);Einecs 229-872-2