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. 2021 Jul 30;8:683671. doi: 10.3389/fmolb.2021.683671

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Copyright © 2021 Schindler, Fragner, Herpell, Berger, Brenner, Tischler, Bellaire, Schönenberger, Li, Sun, Schinnerl, Brecker and Weckwerth.

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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(A) Structures of flavan-3-ol derivatives isolated from nodulated Ardisia crenata leaf tissues. (B) NMR analysis of these flavan-3-ol derivatives. (C) Annotated ESI-MS2 spectrum (pos. mode, CID fragmentation) of anhydromuropeptide with a precursor m/z 922.39 in LC-MS analyses of Psychotria punctata leaf nodule sample.