. 2017 Jun 16;22(6):1003. doi: 10.3390/molecules22061003
© 2017 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 2.
Chemical structure of compounds 1 to 3.