dimethyl 2-(4-oxocyclopent-2-en-1-yl)propanedioate

二甲基(3-氧代环戊基)丙二酸酯

trans-3-Butyl-2-(2-propenyl)cyclopentanone

(2S,3S)-3-butyl-2-prop-2-enylcyclopentan-1-one

3,4,7,8-tetrahydro-2H-oxonin-9-one