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15N solid-state CP-MAS NMR spectrum of the free bases of (p-anisolyl)-dodecylguanidine-[15N2] (A); (p-phenolyl)dodecylguanidine-[15N2] (B); (p-phenolyl)ethylguanidine-[15N2] (C); and the corresponding HBr salts (D-F, respectively). The x axis scale represents chemical shift, in ppm, relative to solid ammonium-[15N] sulfate.
