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. 2020 Mar 27;11:499. doi: 10.3389/fmicb.2020.00499

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Copyright © 2020 Hartmann, Glaser, Holzinger, Ganzera and Karsten.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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MAA compound 1 (klebsormidin A) isolated from extracts of Klebsormidium crenulatum was assigned to the molecular formula C₁₈H₂₉NO₁₃, as established by a positive [M + H]⁺ ion at 468.1699. Uncertain position of the side chain due to missing long range correlation is marked in red.