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The extremely large downfield shift of H-11 in the [sup 1]H NMR spectrum of 1[beta], 15-dihydroxydehydroabietic acid as evidence for an equatorial 1[beta]-hydroxyl group

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The extremely large downfield shift of H-11 in the [sup 1]H NMR spectrum of 1[beta], 15-dihydroxydehydroabietic acid as evidence for an equatorial 1[beta]-hydroxyl group

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