Abstract
The methane negative ion chemical ionization (NICI) mass spectra of the three isomeric tyramine-N-O-dipentafluoropropionate derivatives are unique insofar as each has a different base peak in contrast to their methane positive ion chemical ionization (PICI) mass spectra which are very similar in appearance. Deuterium-labelling studies in the three isomeric tyramine derivatives have elucidated the fragmentation processes accompanying the electron capture NICI process for each derivatized compound.
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