(E)-(R)-1-[(2S,5S,6R)-6-((S)-3-{(2R,4S,6S)-4-(tert-Butyl-dimethyl-silanyloxy)-6-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-tetrahydro-pyran-2-yl}-2-methoxy-propyl)-5-methyl-tetrahydro-pyran-2-yl]-6-methyl-hept-3-en-2-ol