(S)-2-(3-methyl-2-oxotetrahydrofuran-3-yl)acetaldehyde

(S)-(-)-2-methyl-2-(2,2-ethylenedithioethyl)-4-butanolide

2-(Dichlormethyl)-2-methyl-pentannitril

(R)-(-)-2-ethyl-2-methyl-4-butanolide