(4S,5R)-3-tert-Butoxycarbonyl-4-cyclohexyl-methyl-2,2-dimethyloxazolidine-5-carboxylic acid

{(R)-1-[(1S,2S)-1-Cyclohexylmethyl-2-hydroxy-3-(2-oxo-2H-pyridin-1-yl)-propylcarbamoyl]-2-methylsulfanyl-ethyl}-carbamic acid tert-butyl ester

{(R)-1-[(1S,2S)-1-Cyclohexylmethyl-2-hydroxy-3-(4-oxo-4H-pyridin-1-yl)-propylcarbamoyl]-2-methylsulfanyl-ethyl}-carbamic acid tert-butyl ester

{(R)-1-[(1S,2R)-1-Cyclohexylmethyl-2-hydroxy-3-(pyridin-2-ylsulfanyl)-propylcarbamoyl]-2-methylsulfanyl-ethyl}-carbamic acid tert-butyl ester

{(R)-1-[(1S,2R)-1-Cyclohexylmethyl-2-hydroxy-3-(pyridin-4-yloxy)-propylcarbamoyl]-2-methylsulfanyl-ethyl}-carbamic acid tert-butyl ester