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. 2014 Nov 7;21(1):136–149. doi: 10.1002/chem.201404783

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© 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

© 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Scheme 5 — Possible oxidation mechanism: Oxidized NCCs 5/6 or 5epi/6epi, as well as YCC, may arise from the NCCs 4 or 4epi via the reactive azafulvalene-type intermediate X or Xepi.