(S)-4-Benzyl-3-{(2S,6S)-6,7-bis-(tert-butyl-dimethyl-silanyloxy)-2-[(2S,6R)-6-(2-methoxymethoxy-ethyl)-3,6-dihydro-2H-pyran-2-ylmethyl]-4-methylene-heptanoyl}-oxazolidin-2-one