Synonyms: Chromate(1-),bis[2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-3H-pyrazol-3-onato(2-)]-,sodium; Chromate(1-), bis[2,4-dihydro-4-[[2-(hydroxy-kO)-4-nitrophenyl]azo-kN1]-5-methyl-3H-pyrazol-3-onato(2-)-kO3]-, sodium (9CI);3H-Pyrazol-3-one, 2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-,chromium complex