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Electron impact mass spectral (EI\u2010MS) fragmentations of halogenated derivatives of\n                    <jats:italic>N<\/jats:italic>\n                    \u2010acetylcytisine and\n                    <jats:italic>N<\/jats:italic>\n                    \u2010propionylcytisine have been investigated. Detailed fragmentation pathways have been identified for all significant ions including a few characteristic fragment ions. The principal mass spectral fragmentation routes of iodine and bromine compounds have been determined on the basis of low (EI), high resolution (HRD) and\n                    <jats:italic>B<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    \/\n                    <jats:italic>E<\/jats:italic>\n                    linked scan mass spectra as well as linked scans at constant\n                    <jats:italic>B<\/jats:italic>\n                    \/\n                    <jats:italic>E<\/jats:italic>\n                    . 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