(2S,3R)-2-Methyl-3-((2R,4S,5R)-5-methyl-2-phenyl-5-trimethylsilanyloxy-[1,3]dioxan-4-ylmethyl)-oxirane-2-carbaldehyde

(2R,4aR,6S,7R,8aS)-4a,6-Dimethyl-6-((2R,3R)-3-methyl-3-vinyl-oxiranylmethyl)-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-ol