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Exercise D- . An optically active D-aldopentose produced an optically inactive alditel upon treatment with NaBH4. When this aldopentose was subjected to Ruff degradation, a aldotetrose was generated. This aldotetrose gave an optically active aldaric acid upon oxidation with HNO3. Use these data to provide and draw the structure of the starting D-aldopentose showing all the necessary steps 55​

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