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