| 3-Methyl-1-(4-sulfonphenyl)-5-pyrazolone |
| 1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone |
| 4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-Benzenesulfonic acid |
| 4-(4,5-dihydro-3-methyl-5-oxo-1h-pyrazol-1-yl)-benzenesulfonic aci |
| 3-methyl-1-(4-sulfophenyl)-2-pyrazolin-5- one |
| pyrazolic acid 4 |
| 1-(4-Sulfophenyl)-3-methyl-5-pyrazolone |
| Benzenesulfonic acid,4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- |
| 3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one |
| 1-(4'-Sulfophenyl)-3-methyl-5-pyrazolone |