. 2021 Dec 9;22(24):13262. doi: 10.3390/ijms222413262
© 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/).
Figure 17.
The structures of pentanortriterpenoids.