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Compound I is a D-aldopentose that can be oxidized by dilute nitric acid to an optically...

Compound I is a D-aldopentose that can be oxidized by dilute nitric acid to an optically inactive aldaric acid II. On Kiliani-Fischer synthesis (chain extension), I is converted into III and IV; III can be oxidized to an optically active aldaric acid V, but IV is oxidized to an optically inactive aldaric acid VI.
Show the structures of IVI (in the Fischer projection formula).

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