Synonyms: Copper, (u-(tetrahydrogen 4,4'-bis((5-hydroxy-4-((2-hydroxy-5-sulfophenyl)azo)-2-methoxyphenyl)azoxy-2,2'-stilbenedisulfonato(4-)))di-, tetrasodium salt;Cuprate(4-), (mu-((2,2'-(1,2-ethenediyl)bis(5-((5-hydroxy-4-((2-hydroxy-5-sulfophenyl)azo)-2-methoxyphenyl)azoxy)benzenesulfonato))(8-)))di-, tetrasodium;Cuprate(4-), (mu-((2,2'-(1,2-ethenediyl)bis(5-(2-(5-hydroxy-4-(2-(2-hydroxy-5-sulfophenyl)diazenyl)-2-methoxyphenyl)oxidodiazenyl)benzenesulfonato))(8-)))di-, sodium (1:4);Tetrasodium (mu-((2,2'-(vinylene)bis(5-((5-hydroxy-4-((2-hydroxy-5-sulphophenyl)azo)-2-methoxyphenyl)azoxy)benzenesulphonato))(8-)))dicuprate(4-)