83232-53-5 Cuprate(4-), (mu-((3,3'-((3,3'-dihydroxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-ethoxy-4-hydroxy-2,7-naphthalenedisulfonato))(8-)))di-, tetrasodium EINECS 280-287-9 Tetrasodium (mu-((3,3'-((3,3'-dihydroxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-ethoxy-4-hydroxynaphthalene-2,7-disulphonato))(8-)))dicuprate(4-)