. 2017 Nov 10;22(11):1931. doi: 10.3390/molecules22111931
© 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 3.
X-ray crystal structures of 1 and 2.