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. 2013 Jun 14;11(6):2126–2139. doi: 10.3390/md11062126

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Negative chemical ionization (NCIMS) GC/MS chromatographic profile of three members of chemogroup 4 highlighting distinctive features (retention time, characteristic isotope distribution pattern of largest mass ion).