. 2019 Nov 30;24(23):4379. doi: 10.3390/molecules24234379
© 2019 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 2.
Key 1H−1H COSY and HMBC correlations for 1–4.