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D-altrose can be prepared from D-talose by a route that begins with oxidation to D-talaric acid,...

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

Draw the structure of the lactone that yields D-altrose.

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