Enzymatic hydrolysis of racemic 3-acetylthio-2-methylpropionic methyl
ester catalyzed by bovine pancreatic protease and Mucor javanicus lipa
se showed opposite enantioselecivity. A tandem hydrolysis of the ester
catalyzed by these two enzymes gives enantiomerically enriched (S)-3-
acetylthio-2-methylpropionic acid, a building block of captopril.