tert-butyl (4S,5S)-4-isobutyl-5-((1R,2R)-2-(methoxycarbonyl)-4-(2-tosylhydrazineylidene)cyclopentyl)-2,2-dimethyloxazolidine-3-carboxylate

(4S,5S)-5-[(1R,2R)-2-((S)-1-Butylcarbamoyl-ethylcarbamoyl)-cyclopentyl]-4-isobutyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(4S,5S)-4-Isobutyl-2,2-dimethyl-5-{(1R,2R)-4-oxo-2-[(S)-1-(2,2,2-trichloro-ethoxycarbonyl)-ethylcarbamoyl]-cyclopentyl}-oxazolidine-3-carboxylic acid tert-butyl ester

(S)-2-[((1R,2R)-2-{(1S,2S)-2-[(S)-2-((S)-2-Acetylamino-4-methyl-pentanoylamino)-4-methylsulfanyl-butyrylamino]-1-hydroxy-4-methyl-pentyl}-cyclopentanecarbonyl)-amino]-3-methyl-butyric acid

[(S)-1-((S)-1-{(S)-[(1R,2R)-2-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-4-oxo-cyclopentyl]-hydroxy-methyl}-3-methyl-butylcarbamoyl)-3-methylsulfanyl-propyl]-carbamic acid tert-butyl ester