(Z)-4-{(2R,6R)-6-[(7E,12E)-(2S,6S,10S,11S)-6,11-Bis-methoxymethoxy-2-methyl-13-((S)-4-methyl-3,6-dihydro-2H-pyran-2-yl)-4-methylene-10-triethylsilanyloxy-trideca-7,12-dienyl]-5,6-dihydro-2H-pyran-2-yl}-but-2-enoic acid 2-trimethylsilanyl-ethyl ester