3-(Chloromethyl)-2,5,6-trimethylpyrazolo[1,2-a]pyrazole-1,7-dione
5-Methyl-3H-pyrazol-3-one
4-(3,5-Di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one
2-Benzyl-4-bromo-1-methyl-1H-pyrazol-3(2H)-one
