(S)-2-{(S)-2-[3-(Acetyl-benzyloxy-amino)-2-benzyl-propionylamino]-4-methyl-pentanoylamino}-3-phenyl-propionic acid benzyl ester

(4S,7S,12bR)-7-[(R)-2-(Benzyloxyamino-methyl)-3-phenyl-propionylamino]-6-oxo-1,2,3,4,6,7,8,12b-octahydro-benzo[c]pyrido[1,2-a]azepine-4-carboxylic acid methyl ester

((S)-7-{2-[(Benzyloxy-formyl-amino)-methyl]-3-phenyl-propionylamino}-8-oxo-7,8-dihydro-6H-5-oxa-9-aza-benzocyclohepten-9-yl)-acetic acid benzyl ester

benzyl (2-benzyl-3-(1-(benzyloxy)ureido)propanoyl)-L-leucyl-L-phenylalaninate

(S)-2-((S)-2-{2-[(Benzyloxy-formyl-amino)-methyl]-3-phenyl-propionylamino}-4-methyl-pentanoylamino)-3-phenyl-propionic acid benzyl ester