(R)-2-[3-((S)-2-tert-Butoxycarbonylamino-3-phenyl-propionylamino)-propionylamino]-5-isobutoxycarbonyloxy-5-oxo-pentanoic acid methyl ester

Benzyl (2S)-N-(tert-butoxycarbonyl)phenylalanyl-β-alanyl-(α-methyl (2R)-glutamyl)-γ-sarcosinate diester

(R)-2-[3-((S)-2-tert-Butoxycarbonylamino-3-phenyl-propionylamino)-propionylamino]-4-[(2-isobutoxycarbonyloxy-2-oxo-ethyl)-methyl-carbamoyl]-butyric acid methyl ester

(2S)-N-(tert-Butoxycarbonyl)phenylalanyl-β-alanyl-(α-methyl (2R)-glutamyl)-γ-sarcosyl-(2R)-alanyl-(2S)-leucine ester

Benzyl (2S)-N-(tert-butoxycarbonyl)phenylalanyl-β-alanyl-(α-methyl (2R)-glutamyl)-γ-sarcosyl-(2R)-alanyl-(2S)-leucinate diester