Synonyms: Chromate(2-), (2,4-dihydro-4-(2-(2-(hydroxy-kappaO)-4-nitrophenyl)diazenyl-kappaN1)-5-methyl-3H-pyrazol-3-onato(2-)-kappaO3)(3-(2-(4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-(oxo-kappaO)-1H-pyrazol-4-yl)diazenyl-kappaN1)-4-(hydroxy-kappaO)-5-nitrobenzenesulfonato(3-))-, sodium (1:2);Chromate(2-), (2,4-dihydro-4-((2-(hydroxy-kappaO)-4-nitrophenyl)azo-kappaN1)-5-methyl-3H-pyrazol-3-onato(2-)-kappaO3)(3-((4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-(oxo-kappaO)-1H-pyrazol-4-yl)azo-kappaN1)-4-(hydroxy-kappaO)-5-nitrobenzenesulfonato(3-))-, disodium;Chromate(2-), (2,4-dihydro-4-((2-hydroxy-4-nitrophenyl)azo)-5-methyl-3H-pyrazol-3-onato(2-))(3-((4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-oxo-1H-pyrazol-4-yl)azo)-4-hydroxy-5-nitrobenzenesulfonato(3-))-, disodium