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. 2022 Oct 17;19(2):159–167. doi: 10.1038/s41589-022-01147-8

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© The Author(s) 2022

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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Extended Data Fig. 9 — (a) Daughter ion spectrum of prezwittermicin metabolite 693.4142 m/z. (b) Zoom in on 280–340 m/z region of (a), with the daughter ion spectrum of ¹³C₄-labeled prezwittermicin (697.4275 m/z) overlaid in orange. The proposed N-lauroyl-d-asparagine fragment shows the expected +4 m/z shift. (c) Fragmentation pattern of the key fragments highlighted in (a) and (b). (d) Daughter ion spectrum of preedeine metabolite 1155.5952 m/z. (e) Zoom in on 200–490 m/z region of (d), with the daughter ion spectrum of ¹³C₄-labeled preedeine (1159.6011 m/z) overlaid in orange. Several daughter ions show the +4 m/z shift, which can be attributed to the fragmentation events summarized in (f). These data do not distinguish between the 1 and the 2 isomer. The 1 isomer is shown in part (f) for illustrative purposes only.