. 2018 Dec 17;23(12):3341. doi: 10.3390/molecules23123341
© 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 3.
Different representations of isomer 4a.