(2S,4R)-4-(4-Methoxy-benzylsulfanyl)-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid N-methyl-N'-(4-methyl-benzenesulfonyl)-hydrazide 、 benzyl bromide (2S,4R)-4-(4-Methoxy-benzylsulfanyl)-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid N-methyl-N'-benzyl-N'-(4-methyl-benzenesulfonyl)-hydrazide 以to give (2S,4R)-4-Mercapto-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid N-methyl-N′-benzyl- N′-(4-methyl-benzenesulfonyl)-hydrazide as white solid, mp 82.5° C., MS的产率得到(2S,4R)-4-Mercapto-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid N-methyl-N'-benzyl-N'-(4-methyl-benzenesulfonyl)-hydrazide