N-(4-nitrobenzyloxycarbonyl)formamidine 、 (2S,4S)-4-(4-methoxybenzylthio)-1-(4-nitrobenzyloxycarbonyl)-2-[(3R)-pyrrolidin-3-ylaminocarbonyl]pyrrolidine hydrochloride 生成
(2S,4S)-4-mercapto-2-[(3R)-1-(N-4-nitrobenzyloxycarbonylformimidoyl)pyrrolidin-3-ylaminocarbonyl]-1-(4-nitrobenzyloxycarbonyl)pyrrolidine