. 2022 Aug 23;14(17):3442. doi: 10.3390/polym14173442
© 2022 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 (https://creativecommons.org/licenses/by/4.0/).
Figure 7.
A typical scheme for amidation reaction of HA.