. 2021 Aug 31;12(2):581–599. doi: 10.1016/j.apsb.2021.08.027
© 2022 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Figure 9.
The structures of compounds 21 and 22.