. 2018 Aug 28;23(9):2167. doi: 10.3390/molecules23092167
© 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 2.
The key HMBC correlations of compounds 1, 2.