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. 2019 Aug 28;9:12447. doi: 10.1038/s41598-019-48328-5

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© The Author(s) 2019

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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(A) Menadione (2-methylnaphthoquinone) in the ALH 85013 and Murchison meteorites. Traces represent single ion searches for the molecular ion (m/z 172) of 2-methylnaphthoquinone. (B) Mass spectra of menadione (2-methylnaphthoquinone) and corresponding compounds from ALH 85013. The mass spectrum of ALH 85013 was obtained in SIM mode. Additional fragments are due to co-elution of other meteoritic compounds. The Murchison and ALH 85013 GC temperature programs were different, hence the difference in the retention times of menadione (see Methods section).