Synonyms: Cuprate(2-),[m-[4,4'-[methylenebis[(2-hydroxy-4,1-phenylene)azo(4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-4,1-diyl)]]bis[3-methylbenzenesulfonato(6-)]]]di-,disodium; Cuprate(2-), [m-[4,4'-[methylenebis[[2-(hydroxy-kO)-4,1-phenylene](azo-kN1)[4,5-dihydro-3-methyl-5-(oxo-kO)-1H-pyrazole-4,1-diyl]]]bis[3-methylbenzenesulfonato(6-)]]]di-,disodium (9CI); Benzenesulfonic acid,4,4'-[methylenebis[(2-hydroxy-4,1-phenylene)azo(4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-4,1-diyl)]]bis[3-methyl-,copper complex