. 2021 Jul 2;26(13):4065. doi: 10.3390/molecules26134065
© 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/).
Scheme 1.
Synthesis of the target compounds 1, 2, and 3.