(S)-2-({(1R,2R)-2-[(1S,2S)-2-((S)-2-tert-Butoxycarbonylamino-4-methylsulfanyl-butyrylamino)-1-hydroxy-4-methyl-pentyl]-cyclopentanecarbonyl}-amino)-3-methyl-butyric acid benzyl ester

[(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

(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]-propionic acid 2,2,2-trichloro-ethyl 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}-4-oxo-cyclopentanecarbonyl)-amino]-propionic acid 2,2,2-trichloro-ethyl 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}-4-methylene-cyclopentanecarbonyl)-amino]-propionic acid 2,2,2-trichloro-ethyl ester