118-07-0 6-(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)toluene-3-sulphonic acid Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-3-methyl- EINECS 204-232-5