. 2022 Nov 2;27(21):7469. doi: 10.3390/molecules27217469
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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Figure 2.
Chemical structures of (+/−)-usnic acid.