CUPRATE(4-),[.MU.-[[3,3'-[(3,3'-DI(HYDROXY-.KAPPA.O)[1,1'-BIPHENYL]-4,4'-DIYL)BIS(AZO-.KAPPA.N1)]BIS[5-AMINO-4-(HYDROXY-.KAPPA.O)-2,7-NAPHTHALENEDISULFONATO]](8-)]]BIS[2,2'-(IMINO-.KAPPA.N)BIS[ETHANOL-.KAPPA.O]]DI-,DILITHIUM DISODIUM