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3242755285
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note
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The use of deuterium isotope effects in natural product synthesis. See (39-41).
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37
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3242774863
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13C-NMR spectra, mass spectra, and CD spectra are provided as supporting material on Science Online.
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38
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42
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3242809190
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note
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We are grateful to D. Uemura for providing us with natural norzoanthamine. Financial support from the Ministry of Education, Culture, Sports, Science, and Technology, Japan [a Grant-in-Aid for Scientific Research (A) (No. 12304042) and a Grant-in-Aid for Scientific Research on Priority Areas (A) "Exploitation of Multi-Element Cyclic Molecules" (No. 13029003)] is gratefully acknowledged.
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