(4S,5S)-5-((1R,2R)-2-{(S)-1-[(S)-3-Benzyloxycarbonyl-1-((S)-1-benzyloxycarbonyl-2-phenyl-ethylcarbamoyl)-propylcarbamoyl]-ethylcarbamoyl}-cyclopentyl)-4-isobutyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

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

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

4-{1-[1-(1-{[2-(1-benzyloxycarbonyl-ethylcarbamoyl)-cyclopentyl]-hydroxy-methyl}-3-methyl-butylcarbamoyl)-2-(trityl-carbamoyl)-ethylcarbamoyl]-2-methyl-propylcarbamoyl}-4-tert-butoxycarbonylamino-butyric acid benzyl ester