1-{(2R)-2-methyl-3-[(2R,6R)-6-(2-triethylsilanyloxy-ethyl)-3,6-dihydro-2H-pyran-2-yl]propyl}vinyl triofluoromethanesulfonate

(Z)-4-[(2R,6R)-6-((S)-2,4-Dimethyl-pent-4-enyl)-5,6-dihydro-2H-pyran-2-yl]-but-2-enoic acid (E)-(1S,2S)-1-[(E)-3-((4R,6R)-4,6-dimethyl-[1,3]dioxan-2-yl)-allyl]-2-methoxymethoxy-4-((S)-4-methyl-3,6-dihydro-2H-pyran-2-yl)-but-3-enyl ester