... Issue. Journal of Mass Spectrometry. Volume 46, Issue 4, pages 391–401, April 2011. ... J. Mass Spectrom., 46: 391–401. doi: 10.1002/jms.1906. Author Information. ... The EI mass spectrum also shows the 3-methylbenzoyl fragment ion at m/z 119 and benzoyl at m/z 105. ...