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. 2017 Aug 3;8:1450. doi: 10.3389/fmicb.2017.01450

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Copyright © 2017 Auckloo, Pan, Akhter, Wu, Wu and He.

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) or licensor 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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The plausible key MS² fragmentation pathway of 7 and 8 was confirmed by ESI-MS/MS analysis. The characteristic ion at m/z 275.1261 was produced from precursor ion by the loss of C₇H₈O₃ (140 Da) followed by double bonds fragmentation.