methyl 1-methyl-4-oxocyclohex-2-ene-1-carboxylate

(2R)-1-benzyl-2-phenylpiperidin-4-one

反式-4-甲氧基-3-丁烯-2-酮

(S)-2-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-2H-pyran-4(3H)-one

(-)-(2S)-2-[2-(tert-butyldiphenylsiloxy)ethyl]-2H-pyran-4(3H)-one