Synonyms: Cuprate(2-), (4-(hydroxy-kappaO)-3-(2-(2-(hydroxy-kappaO)-5-sulfophenyl)diazenyl-kappaN1)-7-((2,5,6-trichloro-4-pyrimidinyl)amino)-2-naphthalenesulfonato(4-))-, sodium (1:2);Cuprate(2-), (4-(hydroxy-kappaO)-3-((2-(hydroxy-kappaO)-5-sulfophenyl)azo-kappaN1)-7-((2,5,6-trichloro-4-pyrimidinyl)amino)-2-naphthalenesulfonato(4-))-, disodium;Cuprate(2-), (4-hydroxy-3-((2-hydroxy-5-sulfophenyl)azo)-7-((2,5,6-trichloro-4-pyrimidinyl)amino)-2-naphthalenesulfonato(4-))-, disodium;Disodium (4-hydroxy-3-((2-hydroxy-5-sulphophenyl)azo)-7-((2,5,6-trichloro-4-pyrimidinyl)amino)naphthalene-2-sulphonato(4-))cuprate(2-)