(4S,5S)-5-{3-[(S)-2-({[((S)-tert-Butoxycarbonyl-phenyl-methyl)-carbamoyl]-methyl}-carbamoyl)-1-cyclopropylmethyl-2-hydroxy-ethyl]-1-cyclopropylmethyl-ureidomethyl}-4-cyclohexyl-2,2-dimethyl-oxazolidine-3-carboxylic acid isobutyl ester

[(1S,2S)-1-Cyclohexyl-3-(cyclopropylmethyl-amino)-2-hydroxy-propyl]-carbamic acid tert-butyl ester

((1S,2S)-1-Cyclohexyl-3-{3-[(S)-2-cyclopropyl-1-(methoxy-methyl-carbamoyl)-ethyl]-1-cyclopropylmethyl-ureido}-2-hydroxy-propyl)-carbamic acid tert-butyl ester

(4S,5S)-5-{3-[(S)-2-(Carboxymethyl-carbamoyl)-1-cyclopropylmethyl-2-hydroxy-ethyl]-1-cyclopropylmethyl-ureidomethyl}-4-cyclohexyl-2,2-dimethyl-oxazolidine-3-carboxylic acid isobutyl ester

{(S)-2-Acetoxy-3-[3-((2S,3S)-3-tert-butoxycarbonylamino-3-cyclohexyl-2-hydroxy-propyl)-3-cyclopropylmethyl-ureido]-4-cyclopropyl-butyrylamino}-acetic acid methyl ester