Synonyms: Chromate(2-),[2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)][3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-2-hydroxy-5-nitrobenzenesulfonato(3-)]-,disodium; Chromate(2-), [2,4-dihydro-4-[[2-(hydroxy-kO)-4-nitrophenyl]azo-kN1]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)-kO3][3-[[4,5-dihydro-3-methyl-5-(oxo-kO)-1-phenyl-1H-pyrazol-4-yl]azo-kN1]-2-(hydroxy-kO)-5-nitrobenzenesulfonato(3-)]-,disodium (9CI); 3H-Pyrazol-3-one,2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-2-phenyl-, chromiumcomplex; Benzenesulfonic acid,3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-2-hydroxy-5-nitro-,chromium complex