. 2020 Mar 25;25(7):1478. doi: 10.3390/molecules25071478
© 2020 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 (http://creativecommons.org/licenses/by/4.0/).
Scheme 1.
Synthesis of the new derivatives (5a–g).