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Chemical and nuclear magnetic resonance studies were used to show that the major product, A (C^EgA),) obtained in the alkaline permanganate oxidation of maleopimaric acid has the structure V and not the structures previously suggested.A second product isolated in this oxidation has been shown to have structure IX. Further oxidation of A gave a dihydroxylactone diacid for which the revised structure VIII is proposed. Maleopimaric acid gave a crystalline bromolactone, XI. The absolute configuration of V is given.

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