(2S,4R)-4-(2-chloro-benzenesulfonyl)-pyrrolidine-2-carboxylic acid cyanomethyl-amide hydrochloride 、
对氟苯甲酸 、 以to give (2S,4R)-4-(2-chloro-benzenesulfonyl)-1-(4-fluoro-benzoyl)-pyrrolidine-2-carboxylic acid cyanomethyl-amide as a colorless oil的产率得到(2S,4R)-4-(2-chloro-benzenesulfonyl)-1-(4-fluoro-benzoyl)-pyrrolidine-2-carboxylic acid cyanomethyl-amide