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. 2019 May 8;10:464. doi: 10.3389/fphar.2019.00464

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Copyright © 2019 Wan, Yang, McReynolds, Barnych, Wagner, Morisseau, Hwang, Sun, Blöcher and Hammock.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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LC-MS/MS analysis of TPPU putative and synthesized metabolites. The mass spectrometric analysis was conducted under both (A) negative and (B) positive ion modes. (A) The chromatogram of TPPU, metabolites M1–M4, and α-keto amide (M5) metabolite. (B) The chromatogram of TPPU and 4-(trifluoromethoxy)aniline (M6).