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. 2024 Nov 13;14:27891. doi: 10.1038/s41598-024-78721-8

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 3 — (a) optical image of sample TMA2. (b)1: average spectrum of the region in the red frame of panel a; 2: average spectrum of the region in the green frames in panel a, the green arrows indicate the pale orange areas were the most intense spectra were collected; 3: average spectrum of sample TMA1; 4: subtraction spectrum obtained by subtracting 2–3; 5: Syrian rue seeds hydroalcoholic extract. (c) Fingerprint region of spectrum 4 and 5 compared with a harmaline reference spectrum (6). (d) HRMS spectrum and structure of harmaline.