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. 2016 Aug 19;55(37):11178–11182. doi: 10.1002/anie.201606101

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© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Scheme 6 — Formation of tricyclic derivative 21 from barbaralol (18).