L-Val n-butyramide

[(S)-1-((S)-1-{(S)-[(2R,3S)-2-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-tetrahydro-furan-3-yl]-hydroxy-methyl}-3-methyl-butylcarbamoyl)-3-methylsulfanyl-propyl]-carbamic acid tert-butyl ester

(4S,5S)-5-[(3S,4S)-4-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-1-methyl-pyrrolidin-3-yl]-4-isobutyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(3S)-3-[(1S)-1-(tert-butyl-dimethyl-silanyloxy)-(2S)-2-dibenzylamino-4-methyl-pentyl]-tetrahydro-furan-(2R)-2-carboxylic acid N-butyl-L-valine amide

((S)-1-{(S)-[(2R,3S)-2-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-tetrahydro-furan-3-yl]-hydroxy-methyl}-3-methyl-butyl)-carbamic acid tert-butyl ester

[1-benzylsulfanylmethyl-4-(1-butylcarbamoyl-2-methylpropylcarbamoyl)-2-(tert-butyldimethylsilanyloxy)pentyl]carbamic acid tert-butyl ester

[(S)-1-((S)-1-{(S)-[(1R,2R)-2-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-4-oxo-cyclopentyl]-hydroxy-methyl}-3-methyl-butylcarbamoyl)-3-methylsulfanyl-propyl]-carbamic acid tert-butyl ester

[(S)-1-((S)-1-{(S)-[(3S,4S)-4-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-1-methyl-pyrrolidin-3-yl]-hydroxy-methyl}-3-methyl-butylcarbamoyl)-3-methylsulfanyl-propyl]-carbamic acid tert-butyl ester

{(S)-1-[(1S,2S,4R)-4-((S)-1-Butylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-3-methylsulfanyl-propyl}-carbamic acid tert-butyl ester

[1-benzylsulfanylmethyl-4-(1-butylcarbamoyl-2-methylpropylcarbamoyl)-2-hydroxypentyl]carbamic acid tert-butyl ester