Sodium 4-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonate | sodium p-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate |
4-[4,5-Dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonic acid sodium salt | Benzenesulfonic acid, 4-4,5-dihydro-4-(2-hydroxy-5-nitrophenyl)azo-3-methyl-5-oxo-1H-pyrazol-1-yl-, monosodium salt |