sodium 4-[4-[(3-chloro-2-hydroxy-5-nitrophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate

4-[4-[(3-Chloro-2-hydroxy-5-nitrophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonic acid, sodium salt

Benzenesulfonic acid, 4-4-(3-chloro-2-hydroxy-5-nitrophenyl)azo-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl-, monosodium salt