(2S,3R,4S)-3-(tert-Butyl-dimethyl-silanyloxy)-5-hydroxy-2,4-dimethyl-pentanoic acid methyl ester

(2R,3R,4R,5R,6S)-7-Benzyloxymethoxy-5-(tert-butyl-dimethyl-silanyloxy)-3-hydroxy-2,4,6-trimethyl-heptanoic acid 2,6-dimethyl-phenyl ester