(-)-(R)-4-benzyl-3-[(2R,3S)-5-(benzyloxy)-3-(tert-butyldimethylsilyloxy)-2-methylpentanoyl]-1,3-oxazolidin-2-one

(3S,4S)-4-nitrobenzyl 3-hydroxy-4-methyl octanoate

(3S,4S)-4-nitrobenzyl 3-(tert-butyldimethylsilyloxy)-4-methyl octanoate

(3S,4S)-3-((R)-2-tert-Butoxycarbonylamino-4-methyl-pentanoyloxy)-4-methyl-octanoic acid 4-nitro-benzyl ester