(R)-3-Benzyl-4-(tert-butyl-dimethyl-silanyloxy)-butyraldehyde

{(S)-4-[(R)-1-(tert-Butyl-dimethyl-silanyloxymethyl)-2-phenyl-ethyl]-2-isobutyl-3-oxo-2,3-dihydro-1H-pyrrol-2-yl}-acetaldehyde

(R)-2-[(2S,5'S)-5'-((2S,3S)-3-Amino-2-hydroxy-4-phenyl-butyl)-5'-benzyl-2-isobutyl-3,4'-dioxo-2,3,4',5'-tetrahydro-1H,1'H-[2,3']bipyrrolyl-4-yl]-3-phenyl-propionic acid methyl ester

(R)-2-[(2S,5'S)-5'-((2S,3S)-3-Amino-2-hydroxy-4-phenyl-butyl)-5'-benzyl-2-isobutyl-3,4'-dioxo-2,3,4',5'-tetrahydro-1H,1'H-[2,3']bipyrrolyl-4-yl]-N-tert-butyl-3-phenyl-propionamide

(4S,5S)-4-Benzyl-5-[(2S,5'S)-5'-benzyl-4-((R)-1-carboxy-2-phenyl-ethyl)-2-isobutyl-3,4'-dioxo-2,3,4',5'-tetrahydro-1H,1'H-[2,3']bipyrrolyl-5'-ylmethyl]-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester