1,2,5,6,7,8-hexahydropyrrolizin-3-one

3-(吡咯烷-1-基)丙酸甲酯

methyl 3-(2-oxocyclooctyl)propanoate

(3-氧代-1,3-二氢-1-异苯并呋喃)-乙酸甲酯

methyl 2-(3-methoxy-3-oxoprop-1-enyl)benzoate