. 2021 Oct 24;10(11):1090. doi: 10.3390/biology10111090
© 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 2.
Synthesis of compounds 4b and 4c from 1-Gly.