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The transformation of ascorbic acid (AsA) into dehydroascorbic acid (DHA). The transfer of protons (H+) and electrons (e–) is indicated near the arrows. The structural formula of two intermediates, namely, ascorbic anion (AH–) and ascorbic acid radical (A•–), allow changes during three stages of oxidation. The γ-lactone-ring carbons have been numbered (C1–C6) to indicate the endiol group located between C2 and C3.
