N-(N-cyclohexyl-N-methyl-O-t-butyl-(S)-α-aspartyl)-2(S)-{2-[N-(N,N'-di-t-butoxycarbonylamidino)-4-piperidyloxy]ethyl}piperidine

6-((tert-butoxycarbonyl)amino)-2,2-dimethyl-4,15-dioxo-16-phenyl-3-oxa-5,7,14-triazaheptadec-5-en-17-oic acid

3-<(1,1-dimethylethoxy)carbonylamino>-21-<(1,1-dimethylethoxy)carbonyl>-12,15-dioxo-14-thia-2,4,11,16,21,25-hexaazahexacos-2-enedioic acid, bis(1,1-dimethylethyl) ester

N-[N-(α-fluorenylmethoxycarbonyl)-O-t-butyl-(S)-α-aspartyl]-2(S)-{2-[N-(N,N'-di-t-butoxycarbonylamidino)-4-piperidyloxy]ethyl}piperidine

N,N''-bis-tert-butyloxycarbonyl-N'-[4-(N,N''-bis-tert-butyloxycarbonylguanidino)-3-iodobenzyl]guanidine