An optically active d-aldopentose produced on optically, Ask an Expert

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An optically active D-aldopentose produced on optically inactive alditol upon treatment with NaBH4. When this aldopentose was subjected to a Ruff degradation, a D-aldotetrose was generated. This aldotetrose gave an optically active aldaric acid upon oxidation with HNO3. Use these data to provide the structure of the starting D- aldopentose.

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