. 2016 Feb 8;21(2):201. doi: 10.3390/molecules21020201
© 2016 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
Figure 3.
Design strategies for compounds 12–18.