1-呋喃-2-基-2-嘧啶-4-基-乙酮

2,3,4,5-四氯四氢-2-糠酸乙酯

3-己烯-2,5-二酮

6-acetyl-3-ethoxycarbonyl-2-oxabicyclo[3.1.0]hex-3-ene

呋喃基三嗪