(2E,4E)-(S)-7-(tert-Butyl-dimethyl-silanyloxy)-8-[(2R,6S)-6-((2S,3R)-2-methoxy-3-methyl-4-trimethylsilanyloxy-pent-4-enyl)-5,6-dihydro-2H-pyran-2-yl]-4-methyl-octa-2,4-dienoic acid methyl ester