4-methoxycarbonylpent-4-enoate

2-(丙烷-2-基)环戊酮

3-氧代-2-戊基-1-环戊烯-1-乙酸甲酯

2-(2-hydroxyethyl)cyclopentan-1-one

2-prop-2-enylcyclopentan-1-one