[N,N'-di-(tert-butoxycarbonyl)]-2-ethoxyguanidine 、 3-(3-Chlorobenzylsulfonyl)amino-6-methyl-1-carboxymethyl-2-pyridinone 以57%的产率得到3-(3-chlorobenzylsulfonyl)amino-6-methyl-1-{[N,N'-di(tert-butoxycarbonyl)][2-(guanidinooxyethyl)aminocarbonylmethyl]}-2-pyridinone