(E)-2-Methyl-4-((2R,4S,5R)-5-methyl-2-phenyl-5-trimethylsilanyloxy-[1,3]dioxan-4-yl)-but-2-enoic acid ethyl ester

(E)-4-[(2R,4aR,6S,7R,8aS)-7-(tert-Butyl-dimethyl-silanyloxy)-4a,6-dimethyl-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-6-yl]-2-methyl-but-2-en-1-ol