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. 2018 May 23;12:65. doi: 10.1186/s13065-018-0434-1

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — Mass spectrum of, a daunorubicin (IS) precursor ion (protonated precursor [M−H]⁺ ions at m/z 528.46 and b IS product ion (major fragmented product ions at m/z 321.41) showing fragmentation transitions