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(a) Stacked 1H NMR spectra of 1 and (b) L in DMSO-d6. (c) Experimental (blue) and (e) calculated (red) isotopic patterns of [1-4PF6]4+ fragment. (d) Experimental (blue) and (f) calculated (red) isotopic patterns of [1-5PF6]5+ fragment in ESI-MS analyses.
