3-[4-(2-Hydroxy-5-methyl-3-nitrophenylazo)-3-methyl-5-oxo-2-pyrazolin-1-yl]benzenesulfonamide

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

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