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|IUPAC RECOMMENDATIONS 2013|
|Rule stating that a neutral organic molecule containing one or more atoms of the elements C, H, O, N, S, P, or any halogen has an odd nominal mass if it contains an odd number of nitrogen atoms.|
F. W. McLafferty, F. Turecek. Interpretation of Mass Spectra, University Science Books, Mill Valley, CA (1993).
|From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.|