. 2018 Sep 3;23(9):2241. doi: 10.3390/molecules23092241
© 2018 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/).
Figure 6.
The synthesis of compounds 1 (a) and 2 (b).