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. 2018 May 21;18:90. doi: 10.1186/s12870-018-1303-8

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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. 3 — Product ion spectra of ions derived from 18, 19, and 20. a [1−9-NαC]-MLIPPFFLI (18, m/z 1072.6246) at t_R 7.4 min, b [1−9-NαC]-OLIPPFFLI (19, m/z 1088.6211) at t_R 3.7 min, and c [1−9-NαC]-JLIPPFFLI (20, m/z 1104.6150) at t_R 5.7 min