. 2020 Jul 11;25(14):3172. doi: 10.3390/molecules25143172
© 2020 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 15.
Structural illustration of maleic acid.