. 2015 Jun 29;20(7):11861–11874. doi: 10.3390/molecules200711861
© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).
Scheme 1.
Synthetic route of the target compounds.