. 2020 May 3;2020:8797284. doi: 10.1155/2020/8797284
Copyright © 2020 Sélestin Dongmo Sokeng et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 3.
1H NMR spectrum (CDCl3, 500 MHz) of PEN4.