6,6-二氟六氢-2H-环戊二烯并[b]呋喃-2,5-二醇

2-prop-2-enylcyclopentane-1,3-dione

2-methyl-2-prop-2-ynylcyclopentane-1,3-dione

8-bromo-1,4-dithiaspiro[4.4]non-8-ene

3-(methylamino)cyclopent-2-en-1-one