4-penten-1-yl 5,6-dihydro-4-methyl-2H-pyran-2-yl ether

Acetic acid (S)-1-cyanomethyl-3-hydroxy-1-methyl-propyl ester

ethyl (R)-2-(2-methyloxiran-2-yl)acetate

甲瓦龙酸内酯