3-(1-Bromo-ethyl)-5-ethyl-2,6-dimethyl-pyrazolo[1,2-a]pyrazole-1,7-dione

3-ethyl-4-chloro-4-methyl-5-pyrazolinone

2,3,5,6-四甲基-1H,7H-吡唑并[1,2-a]吡唑-1,7-二酮

甲基碘

2-methyl-3-oxopentanoic acid ethyl ester