(4R,5S)-5-Dibenzylamino-4-hydroxy-6-methyl-hept-2-ynoic acid ethyl ester

tert-butyl (S)-2-methyl-1-((S)-oxiran-2-yl)propylcarbamate

(R)-5-((S)-1-tert-Butoxycarbonylamino-2-methyl-propyl)-2-oxo-tetrahydro-furan-3-carboxylic acid ethyl ester

(4R,5S)-5-tert-Butoxycarbonylamino-4-hydroxy-6-methyl-heptanoic acid ethyl ester

(4R,5S)-5-tert-Butoxycarbonylamino-4-methanesulfonyloxy-6-methyl-heptanoic acid ethyl ester