(E)-(R)-6-(tert-Butyl-dimethyl-silanyloxy)-4-methoxymethoxy-hex-2-enoic acid ethyl ester

(1'Z)-(1S,4R,5S,6R)-2-methoxy-6-(methoxymethyl)oxy-4-[(5'-methoxycarbonyl)pent-1'-enyl]-3-oxabicyclo[3.3.0]octane