[N,N'-di(tert-butoxycarbonyl)](1-aminocyclopropanemethoxy)guanidine 、
[3-[(苄基磺酰基)氨基]-6-甲基-2-氧代-1,2-二氢吡啶基]乙酸 以60%的产率得到3-Benzylsulfonylamino-6-methyl-1-{[N,N'-di(tert-butoxycarbonyl)][1-(1-(guanidinooxymethyl)cyclopropylamino)carbonylmethyl]}-2-pyridinone