Synonyms: Chromate(1-), (2-(2-(4,5-dihydro-3-methyl-1-(2-methyl-4-sulfophenyl)-5-(oxo-kappaO)-1H-pyrazol-4-yl)diazenyl-kappaN1)-4-sulfobenzoato(4-)-kappaO)-, hydrogen (1:1);Chromate(1-), (2-((4,5-dihydro-3-methyl-1-(2-methyl-4-sulfophenyl)-5-oxo-1H-pyrazol-4-yl)azo)-4-sulfobenzoato(4-))-, hydrogen;Hydrogen (2-((4,5-dihydro-3-methyl-5-oxo-1-(4-sulpho-o-tolyl)-1H-pyrazol-4-yl)azo)-4-sulphobenzoato(4-))chromate(1-);chromium(2+) hydrogen 2-{(2Z)-2-[3-methyl-1-(2-methyl-4-sulfonatophenyl)-5-oxo-1,5-dihydro-4H-pyrazol-4-ylidene]hydrazinyl}-4-sulfonatobenzoate (1:1:1)