[(S)-1-((S)-1-{(S)-[(1R,2R)-2-((S)-1-Butylcarbamoyl-ethylcarbamoyl)-cyclopentyl]-hydroxy-methyl}-3-methyl-butylcarbamoyl)-3-methylsulfanyl-propyl]-carbamic acid tert-butyl ester

(4S)-isobutyl-(5S)-((2R)-methoxycarbonyl-cyclopentyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(S)-2-{(S)-2-[((1R,2R)-2-{(1S,2S)-2-[(S)-2-tert-Butoxycarbonylamino-3-(trityl-carbamoyl)-propionylamino]-1-hydroxy-4-methyl-pentyl}-cyclopentanecarbonyl)-amino]-propionylamino}-pentanedioic acid dibenzyl ester

(4S)-isobutyl-(5S)-(1-methoxycarbonylmethyl-allyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

4-(1-benzyloxycarbonyl-2-phenyl-ethylcarbamoyl)-4-{2-[(2-{2-[2-(2-tert-butoxycarbonylamino-3-methyl-butyrylamino)-3-(trityl-carbamoyl)-propionylamino]-1-hydroxy-4-methyl-pentyl}-cyclopentanecarbonyl)-amino]-propionylamino}-butyric acid benzyl ester