(2S,3R,5S,6S)-3-vinyl-5,6-dimethoxy-5,6-dimethyl-1,4-dioxane-2-carbaldehyde

(2S,3S,4aR,5S,6R,8aR,2'R,3'R)-6-(3',4'-dibenzyloxy-2'-methylbutyl)-2,3-dimethoxy-5-methoxymethoxy-2,3-dimethyl-2,3,4a,5,6,8a-hexahydrobenzo[1,4]dioxine