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. 2020 Aug 24;11:4219. doi: 10.1038/s41467-020-17990-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Radical trapping experiments. b The reaction of unsymmetrical 1,3-dione. c The reactions using other amide solvents. d ¹³C-labeled experiment using DMF-formyl-¹³C as solvent. e ¹³C-labeled experiment using DMF-dimethyl-¹³C₂ as solvent. f Deuterium-labeling experiments using DMF-D7 as solvent. g Deuterium-labeling experiments in the presence of D₂O. h ¹⁸O-labeled experiment in the presence of H₂¹⁸O. i The reactions of ¹⁸O-labeled 1,3-dione.