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