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note
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The stereochemistry of (+)-55 was later confirmed by comparison of the NMR data of (-)-41 with those of known (+)-41; see ref 13.
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note
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We thank Dr. John W. Daly, National Institutes of Health, for kindly providing the 400 MHz 1H NMR and the proton/carbon HMBC spectra for the natural antipode of alkaloid 205B.
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