. 2016 Oct 12;21(10):1344. doi: 10.3390/molecules21101344
© 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 Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
Figure 1.
Chemical structures of compounds 1–3 and 1a–e.