. 2021 Jul 12;26(14):4225. doi: 10.3390/molecules26144225
© 2021 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/).
Scheme 6.
Synthesis of N-methylated compounds.