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. 2021 Jul 31;19(8):439. doi: 10.3390/md19080439

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© 2021 by the authors.

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/).

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(A) Key COSY (bold) and HMBC (H→C, arrows) correlations observed for compound 2. (B) Key NOESY correlations (dashed line) shown on the Chem3D-optimized model of 2.