D -Sedoheptulose is a sugar intermediate in a metabolic cycle (the pentose oxidation cycle) that ultimately converts glucose into 2,3-dihydroxypropanal (glyceraldehyde) plus three equivalents of CO₂. Determine the structure of D-sedoheptulose from the following information. 

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6 HIO, D-Sedoheptulose 4 HCOH + 2 HCH + CO2 C,H;NHNH, an osazone identical with that formed by another sugar, aldoheptose A D-Sedoheptulose Ruff degradation Aldoheptose A aldohexose B HNO3, H,O, A Aldohexose B → an optically active product Ruff degradation Aldohexose B → D-ribose