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19F spin exchange of formyl-MLF. (a) Chemical structure and 19F isotropic chemical shifts. (b) 19F DP spectrum (black) at 25 kHz MAS. (c) 2D 19F–19F correlation spectrum measured using 300 ms CORD mixing. (d) Normalized intensities of the cross peaks and diagonal peaks as a function of mixing time. (e) Spin exchange time constants for the 19F–19F distance in formyl-MLF (PDB: 1q7o70).
