Journal Pre-proof Molecular evolution during hydrothermal reactions from formaldehyde and ammonia simulating aqueous alteration in meteorite parent bodies Yoko Kebukawa, Satoru Nakashima, Hajime Mita, Yasuji Muramatsu, Kensei Kobayashi PII: S0019-1035(20)30209-8 DOI: https://doi.org/10.1016/j.icarus.2020.113827 Reference: YICAR 113827 To appear in: Icarus Received date: 9 May 2019 Revised date: 21 April 2020 Accepted date: 23 April 2020 Please cite this article as: Y. Kebukawa, S. Nakashima, H. Mita, et al., Molecular evolution during hydrothermal reactions from formaldehyde and ammonia simulating aqueous alteration in meteorite parent bodies, Icarus (2020), https://doi.org/10.1016/ j.icarus.2020.113827 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Published by Elsevier.