. 2018 Jul 4;23(7):1628. doi: 10.3390/molecules23071628
© 2018 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/).
Scheme 4.
Addition of leucine to lead compound, 13h.