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13C NMR spectra, as well as appropriate parent ion identification by high-resolution mass spectrometry. (b) In addition, an analytical sample of this compound, obtained by recrystallization or liquid chromatography, gave satisfactory combustion analysis (within 0.4%).
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16944367198
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note
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We thank Professor Richard E. Moore, University of Hawaii, Mànoa, for samples of natural (+)-acutiphycin and (+)-tarns-20,21-didehydroacutiphycin.
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16944365202
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13C. Optical rotations were obtained with a Perkin-Elmer model 241 polarimeter. High-resolution mass spectra were measured at the University of Pennsylvania Mass Spectrometry Service Center with a VG Micromass 70/70H or VG ZAB-E spectrometer. Microanalyses were performed by Robertson Laboratories, Madison, NJ. High-performance liquid chromatography (HPLC) was performed with a Ranin component analytical/ semipreparative system.
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