. 2019 Feb 2;24(3):548. doi: 10.3390/molecules24030548
© 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.
Synthetic route of all the target compounds.