68140-35-2 Cuprate(4-), (mu-(4-amino-6-((3,3'-di(hydroxy-kappaO)-4'-((2-(hydroxy-kappaO)-3,6-disulfo-1-naphthalenyl)azo-kappaN1)(1,1'-biphenyl)-4-yl)azo-kappaN1)-5-(hydroxy-kappaO)-1,3-naphthalenedisulfonato(8-)))di-, tetrasodium