(2S,4R)-4-(2-chlorobenzenesulfonyl)-2-(1-cyanocyclopropylcarbamoyl)pyrrolidine hydrochloric acid 、
氯甲酸环戊酯 以to give (2S,4R)-4-(2-chloro-benzenesulfonyl)-2-(1-cyano-cyclopropylcarbamoyl)-pyrrolidine-1-carboxylic acid cyclopentyl ester as a colorless oil的产率得到(2S,4R)-4-(2-chloro-benzenesulfonyl)-2-(1-cyano-cyclopropylcarbamoyl)-pyrrolidine-1-carboxylic acid cyclopentyl ester