(3aR,6S,7S,7aR)-7-((tert-butyldimethylsilyl)oxy)-2',2'-dimethyltetrahydrospiro[pyrano[3,4-d]oxazole-6,4'-[1,3]dioxolan]-2(3H)-one

(3aR,6S,7S,7aR)-7-((tert-butyldimethylsilyl)oxy)-2',2',3-trimethyltetrahydrospiro[pyrano[3,4-d]oxazole-6,4'-[1,3]dioxolan]-2(3H)-one

3-O-benzoyl-1,2-O-isopropylidene-β-D-fructopyranose

(2S,3S)-3-benzoyloxy-3,6-dihydro-2',2'-dimethyl-2H-pyran-2-spiro-4'-(1',3'-dioxolane)

(2S,3S)-3,6-dihydro-3-hydroxy-2',2'-dimethyl-2H-pyran-2-spiro-4'-(1',3'-dioxolane)