(E)-(S)-2-methylhexa-3,5-dienoic acid (1R,2S)-1-((R)-{(2S,5S)-5-[(E)-4-((4R,5R)-2,2-dimethyl-5-vinyl-[1,3]dioxolan-4-yl)but-3-enyl]-tetrahydrofuran-2-yl}triethylsilanyloxymethyl)-2-methylpent-4-ynyl ester