O-tert-Butyl-L-4-hydroxy-prolin-tert-butylester 、
L-脯氨酸叔丁酯 、
3-(acetylthio)propanoyl chloride 、 以1-(3-acetylthio-1-oxopropyl)-4,5-dihydro-4-hydroxy-1H-pyrrole-2-carboxylic acid is obtained的产率得到1-(3-acetylthio-1-oxopropyl)-4,5-dihydro-4-hydroxy-1H-pyrrole-2-carboxylic acid