3,4,5-三甲基吡咯-2-甲基乙酯

4,5-二甲基-1H-吡咯-2-羧酸乙酯

重氮基乙酰乙酸乙酯

(4Z)-3-Methyl-1-phenyl-1H-pyrazole-4,5-dione 4-oxime

2-hydroxyimino-3-phenylhydrazono-butyric acid ethyl ester