(S)-4-((2S,4S)-4-isopropyl-5-oxo-tetrahydro-furan-2-yl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(2S,4S,5S)-6-(benzyloxy)-5-(tert-butoxycarbonylamino)-4-(tert-butyldimethylsilyloxy)-2-isopropylhexanoic acid

(2S,4S,5S)-5-amino-6-benzyloxy-4-hydroxy-2-isopropyl-hexanoic acid [(1S,2S)-1-(4-fluoro-benzylcarbamoyl)-2-methyl-butyl]-amide trifluoroacetate

[(S)-2-benzyloxy-1-((2S,4S)-4-isopropyl-5-oxo-tetrahydro-furan-2-yl)-ethyl]-carbamic acid tert-butyl ester

tert-butyl {(1S)-2-hydroxy-1-[(2S,4S)-4-isopropyl-5-oxotetrahydrofuran-2-yl]ethyl}carbamate

(S)-{(2S,4S)-1-benzyloxymethyl-4-[(1S,2S)-1-(4-fluoro-benzylcarbamoyl)-2-methyl-butylcarbamoyl]-2-hydroxy-5-methyl-hexyl}-carbamic acid tert-butyl ester