((2R,3R,4R,5R,6S)-4,5-Bis-benzyloxy-6-methoxy-2-vinyl-tetrahydro-pyran-3-yloxy)-but-3-enyloxy-dimethyl-silane

(1R,6R,8S,9R,10S)-9,10-bis(benzyloxy)-8-methoxy-2,7-dioxabicyclo[4.4.0]dec-4-ene