4-(4,5-Dihydro-4-isopropylidene-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid, compound with piperidine (1:1) 63123-38-6 Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-4-(1-methylethylidene)-5-oxo-1H-pyrazol-1-yl)-, compd. with piperidine (1:1) EINECS 263-881-2