3-(1-hydroxy-3-oxobutylidene)-1,5-dioxaspiro[5.5]undecane-2,4-dione

[(2S,3R)-2-methyl-6-oxo-2,3-dihydropyran-3-yl] acetate

3,4-二-O-乙酰-1,5-酐-2,6-双脱氧-L-阿拉伯-己-1-糖醇

(6S)-4-hydroxy-6-methyltetrahydro-2H-pyran-2-one

ethyl (S)-propanoyloxyhex-2-enoate