Cuprate, [μ-[[4,4'-[methylenebis[(2-hydroxy-4,1-phenylene) azo]]bis[3-hydroxy-2,7-naphthalenedisulfonato]]]]di-, tetrasodium

tetrasodium [mu-[[4,4'-[methylenebis[(2-hydroxy-p-phenylene)azo]]bis[3-hydroxynaphthalene-2,7-disulphonato]](8-)]]dicuprate(4-)

Cuprate(4-), [μ-[[4,4'-[methylenebis[ (2-hydroxy-4,1-phenylene)azo]]bis[3-hydroxy-2,7 -naphthalenedisulfonato]](8-)]]di-, tetrasodium