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. 2019 Jul 1;6:2. doi: 10.1186/s40694-019-0072-y

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Structures of (M)-viriditoxin and (P)-viriditoxin (1 and 1′), as well as related metabolites produced by other fungi. The “M” and “P” refer to the atropisomer confirmations, with the helical configurations illustrated by the bold lines. 1 is the major form produced by A. viridinutans and P. variotii. Carbon numbers C3, C4 and C7 are indicated