Look at the given sugar cyclization reaction and use the letter codes to fill in the appropriate compound.   The beta-furanose of the original sugar is Compound [Fill in the blank], . The beta-pyranose of the original sugar is Compound [Fill in the blank], . The alpha-furanose of the original sugar is Compound [Fill in the blank], . The alpha-pyranose of the original sugar is Compound [Fill in the blank], . Compound [Fill in the blank], is the C-4 epimer of the original sugar (diastereomer at C4). Compound [Fill in the blank], is the C-3 epimer of the original sugar (diastereomer at C3).  多项填空题

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