Synthesis of 5-hydroxy-1,7-dioxaspiro[5.5]undec-3-en-2-ones from 2-benzenesulfonyltetrahydropyrans and 5-hydroxybutenolides: X-ray crystal structure determination for (5RS,6SR)-5-acetoxy-4-methoxy3-methyl-1,7-dioxaspiro[5.5]undec-3-en-2-one

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