{3-[(S)-1-[(R)-2-tert-Butoxycarbonylamino-3-(4-fluoro-phenyl)-propionyl]-4-((S)-1-methylcarbamoyl-2-naphthalen-2-yl-ethyl)-3-oxo-piperazin-2-yl]-propyl}-carbamic acid benzyl ester

(S)-2-Acetylamino-pentanedioic acid 5-amide 1-{[(R)-2-[(S)-2-(3-amino-propyl)-4-((S)-1-methylcarbamoyl-2-naphthalen-2-yl-ethyl)-3-oxo-piperazin-1-yl]-1-(4-fluoro-benzyl)-2-oxo-ethyl]-amide}

N,N'-bis-Boc-S-methyl-isothiourea