. 2022 Oct 5;27(19):6604. doi: 10.3390/molecules27196604
© 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/).
Scheme 4.
Catalytic hydrogenation of compound 5.