. 2021 Jun 28;26(13):3959. doi: 10.3390/molecules26133959
© 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/).
Figure 7.
Structures of butanolides and butenolides.