(+)-(1S,5R,6S)-2-oxobicyclo[3.1.0]hexane-6-carboxylic acid

2-环戊烯酮

(乙氧基羰基甲基)二甲基溴化硫鎓

ethyl (1R,5S,6S)-4-oxobicyclo[3.1.0]hex-2-ene-6-carboxylate

(-)-(3Ar,6ar)-3a,6a-二氢-2,2-二甲基-4H-环戊并-1,3-二氧代-4-酮