(E)-(R)-6-{(2R,5R,2'R,5'R)-5'-[(E)-(R)-6-(tert-Butyl-dimethyl-silanyloxy)-1-(2-trimethylsilanyl-ethoxymethoxy)-hex-2-enyl]-octahydro-[2,2']bifuranyl-5-yl}-6-(2-trimethylsilanyl-ethoxymethoxy)-hex-4-enal