N-Benzyloxy-N'-{(S)-1-[2-(4-hydroxy-phenyl)-ethylcarbamoyl]-3-phenyl-propyl}-2-isobutyl-malonamide

2-Benzyl-N-benzyloxy-N'-[(S)-3-phenyl-1-(2-p-tolyl-ethylcarbamoyl)-propyl]-malonamide

4-{2-[(S)-2-(2-Benzyloxycarbamoyl-4-methyl-pentanoylamino)-4-phenyl-butyrylamino]-ethyl}-benzoic acid methyl ester

((S)-3-Chloro-2-oxo-1-phenethyl-propyl)-carbamic acid benzyl ester