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L-allose can be prepared from D-allose by a route that begins with oxidation to D-allaric acid,...

L-allose can be prepared from D-allose by a route that begins with oxidation to D-allaric acid, which cyclizes to form two six-membered-ring lactones. After separating the lactones and reducing them with sodium amalgam, one lactone returns D-allose while the other one yields L-allose.

Draw the structure of the lactone that yields L-allose and show stereochemistry.

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