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Solid-state cross-polarized magic-angle spinning (CP-MAS) 15N NMR spectra of (A) crystalline dodecyl-guanidine-[15N2] free base, (B) crystalline dodecylguanidinium-[15N2] bromide, and (C) crystalline p-phenol-dodecyl-guanidine-[15N2] free base.
