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