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. 2022 Jun 29;13:909914. doi: 10.3389/fphar.2022.909914

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Copyright © 2022 Vaneková and Rollinger.

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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The chemical structures of α-amyrin (A), ß-amyrin (B), usolic acid (C), oleanolic acid (D), monotropein (E), geniposidic acid (F), deacetylasperulosidic acid (G) and scandoside (H).