(3S,4R,6R,7S)-3,7-Bis-(tert-butyl-dimethyl-silanyloxy)-4,6-bis-(tert-butyl-dimethyl-silanyloxymethyl)-7-[(2S,3R)-2-methyl-3-((Z)-(S)-1-methyl-but-2-enyl)-oxiranyl]-5-oxo-heptanoic acid methoxy-methyl-amide

(3S,4R,5R,6S,7S)-7-(tert-Butyl-dimethyl-silanyloxy)-4,6-bis-(tert-butyl-dimethyl-silanyloxymethyl)-3,5-dihydroxy-7-{(2S,3R)-3-[(S)-2-(4-methoxy-benzyloxy)-1-methyl-ethyl]-2-methyl-oxiranyl}-heptanoic acid methoxy-methyl-amide