(((3S,4R)-4-(benzyloxy)-2-methylenetetrahydro-2H-pyran-3-yl)oxy)(tert-butyl)dimethylsilane

methyl (7R,8S)-7-(benzyloxy)-8-((tert-butyldimethylsilyl)oxy)-4-oxaspiro[2.5]octane-1-carboxylate

methyl 4-((2R,3R)-3-(benzyloxy)-2-((tert-butyldimethylsilyl)oxy)tetrahydrofuran-2-yl)-4-oxobutanoate

methyl (7R,8S)-7-acetoxy-8-((tert-butyldimethylsilyl)oxy)-4-oxaspiro[2.5]octane-1-carboxylate

methyl 4-((2R,3R)-3-acetoxy-2-((tert-butyldimethylsilyl)oxy)tetrahydrofuran-2-yl)-4-oxobutanoate