(2S,4S)-4-nitrobenzyl2-(dimethylcarbamoyl)-4-mercaptopyrrolidine-1-carboxylate;(2S,4S)-2-(Dimethylaminocarbonyl)-4-mercapto-1-(p-nitrobenzyloxycarbonyl)-1-pyrrolidine
(2S,4S)-4-nitrobenzyl2-(dimethylcarbamoyl)-4-mercaptopyrrolidine-1-carboxylate;(2S,4S)-2-(Dimethylaminocarbonyl)-4-mercapto-1-(p-nitrobenzyloxycarbonyl)-1-pyrrolidine