Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-4-(1-methylethylidene)-5-oxo-1H-pyrazol-1-yl)-, compd. with piperidine (1:1);4-(4,5-Dihydro-4-isopropylidene-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid, compound with piperidine (1:1);4-[3-methyl-5-oxo-4-(propan-2-ylidene)-4,5-dihydro-1H-pyrazol-1-yl]benzenesulfonic acid - piperidine (1:1)
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