(3R,4S,5R)-3,5-bis[(tert-butyldimethylsilyl)oxy]-4-[3-(tert-butyldimethylsilyl)oxy-2,2-ethanopropyl]oxyoct-1-en-7-yne

(1aS,2S,3aR,6R,7aR,7bS)-2-methoxy-6-phenyltetrahydrooxireno[2',3':4,5]pyrano[3,2-d][1,3]dioxine-7b(4H)-carbonitrile