(2R,3R,4S,5S)-2-((benzoyloxy)methyl)-5-(((N-((S)-1-(tert-butoxy)-1-oxo-3-phenylpropan-2-yl)-2-nitrophenyl)sulfonamido)methyl)tetrahydrofuran-3,4-diyl dibenzoate

(S)-2-[Methyl-((S)-3-methyl-2-methylamino-butyryl)-amino]-3-phenyl-propionic acid tert-butyl ester

(S)-2-(Methyl-{(S)-3-methyl-2-[methyl-((S)-3-methyl-2-methylamino-butyryl)-amino]-butyryl}-amino)-3-phenyl-propionic acid tert-butyl ester

(S)-2-{Methyl-[(S)-3-methyl-2-(methyl-{(S)-3-methyl-2-[methyl-((S)-3-methyl-2-methylamino-butyryl)-amino]-butyryl}-amino)-butyryl]-amino}-3-phenyl-propionic acid tert-butyl ester

(S)-2-{Methyl-[(S)-3-methyl-2-(methyl-{(S)-3-methyl-2-[methyl-(2-nitro-benzenesulfonyl)-amino]-butyryl}-amino)-butyryl]-amino}-3-phenyl-propionic acid tert-butyl ester