CAS No 70209-87-9 , Chromate(2-),[2,4-dihydro-4-[2-[2-(hydroxy-kO)-4-nitrophenyl]diazenyl-kN1]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)-kO3][3-[2-[4,5-dihydro-3-methyl-5-(oxo-kO)-1-phenyl-1H-pyrazol-4-yl]diazenyl-kN1]-2-(hydroxy-kO)-5-nitrobenzenesulfonato(3-)]-,sodium (1:2)