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2D amide 1H–15N (a–d) and methyl 1H–13C (f–h) correlation spectra acquired at variable MAS frequencies [(a) 20, (b,f) 40, (c,g) 60, and (d,h) 111 kHz] on a microcrystalline sample of protonated GB1 (structure displayed with hydrogen atoms in blue in panel e).
