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Schematic representation of major fragmentation pathways of nitrated POPS derivatives observed in negative-ion mode. A possible chemical structure of nitrated POPS with the nitro (NO2) and nitroso (NO) groups located in C9 is represented, but other possibilities should be considered, namely the nitro (NO2) and nitroso (NO) groups at C10, as reported for the nitration of oleic acid [12].
