. 2018 Mar 30;23(4):798. doi: 10.3390/molecules23040798
© 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/).
Figure 3.
Key NOESY correlations of compounds 1–4.