4-[1-[2-(3-{6-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-3,6-dihydro-2H-pyran-2-yl}-2-methyl-propyl)-allyl]-5-(tert-butyl-diphenyl-silanyloxy)-6-methoxymethoxy-8-(4-methyl-3,6-dihydro-2H-pyran-2-yl)-octa-2,7-dienyloxy]-pentan-2-ol