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Fig. 5
Mass spectra of 4-MeQ (lower panel) and 6-MeQ (upper panel). Gaussian profiles have been plotted with centres at 117 and 129 amu for 4-MeQ and 115 and 129 amu for 6-MeQ. The main fragmentation channels are identified to be methyl loss and loss of a molecule containing two carbon atoms and a number of hydrogen atoms.
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