. 2019 Jul 17;24(14):2607. doi: 10.3390/molecules24142607
© 2019 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.
Design ideas for the target compounds.