3-甲基-2-环戊烯-1-酮

2,2,4,5-tetrachlorocyclopent-4-ene-1,3-dione

3,4-diphenylphenol

2,2-dibromocyclopent-4-ene-1,3-dione

4-(乙酰氧基)-2-环戊烯-1-酮