Benzenesulfonic acid,4-(4,5-dihydro-4-(2-(2-hydroxy-5-methyl-3-nitrophenyl)diazenyl)-3-methyl-5-oxo-1H-pyrazol-1-yl)-,sodium salt (1:1), Benzenesulfonic acid,4-(4,5-dihydro-4-((2-hydroxy-5-methyl-3-nitrophenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)-,monosodium salt, EINECS 263-340-0, Sodium p-(4,5-dihydro-4-((2-hydroxy-5-methyl-3-nitrophenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonate,