6408-08-8 72939-55-0 Cuprate(4-), (mu-((7,7'-((3,3'-di(hydroxy-kappaO)(1,1'-biphenyl)-4,4'-diyl)bis(azo-kappaN1))bis(8-(hydroxy-kappaO)-1,6-naphthalenedisulfonato))(8-)))di-, tetrasodium EINECS 277-109-7 Tetrasodium (mu-((7,7'-((3,3'-dihydroxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(8-hydroxynaphthalene-1,6-disulphonato))(8-)))dicuprate(4-)