(R)-1-{(S)-2-[2-((2S,9R)-2-Amino-9-hydroxy-8-oxo-decanoylamino)-2-methyl-propionylamino]-3-phenyl-propionyl}-pyrrolidine-2-carboxylic acid

(S)-2-(dibenzylamino)-6-oxohexanoic acid benzyl ester

(R)-1-((S)-2-{2-[(2S,9R)-2-tert-Butoxycarbonylamino-9-(tert-butyl-dimethyl-silanyloxy)-8-oxo-decanoylamino]-2-methyl-propionylamino}-3-phenyl-propionyl)-pyrrolidine-2-carboxylic acid

(E)-(S)-2-Dibenzylamino-6-methoxy-hex-5-enoic acid benzyl ester

(S)-2-dibenzylamino-5-hydroxypentanoic acid benzyl ester