4-hydroxy-4-methyl-5-prop-2-enylcyclopent-2-en-1-one

3-acetoxy-2-allyl-3-methyl-4-cyclopentenone

2-炔丙基-3-甲基-4-羟基-2-环戊烯-1-酮

3-Hydroxy-8-nonyne-2,5-dione

Dimethyl 2-(2-propynyl)-3-oxoglutarate