The applicability of high-energy fast atom bombardment (FAB) collision-induced dissociation mass spectrometry/mass spectrometry (CID-MS/MS) to the structural characterization of side-chains of porphyrin derivatives with a "tailed picketfence" structure was examined. These porphyrins showed a molecular ion EBEB-type four-sector tandem mass spectrometer, showed charge-remote product ions much more clearly than those observed in B/E-constant linked-scan spectra.
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