Synonyms: tetrasodium [mu-[[2,2'-[carbonylbis[imino(2-sulpho-p-phenylene)vinylene(3-sulpho-p-phenylene)(4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1,4-diyl)azo]]bis[benzoato]](8-)]]dicuprate(4-);Cuprate, [μ-[[2,2'-[carbonylbis[imino(2-sulfo-4,1-phenylene)-2,1-ethenediyl(3-sulfo-4,1-phenylene)(4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1,4-diyl)azo]]bis[benzoato]]]]di-, tetrasodium;Cuprate(4-), [μ-[[2,2'-[carbonylbis[ imino(2-sulfo-4,1-phenylene)-2,1-ethenediyl(3-sulfo -4,1-phenylene)(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol e-1,4-diyl)azo]]bis[benzoato]](8-)]]di-, tetrasodium