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13C and 15N chemical shifts correlated by their 15N-13C heteronuclear dipolar couplings in SLF spectra of a 15N, 13Cα NAL single crystal. A. 15N decoupled 13C NMR spectrum. B. 13C decoupled 15N NMR spectrum. C. 13C-detected 15N-13C heteronuclear dipolar coupling SLF spectra. D. 15N-detected 15N-13C heteronuclear dipolar coupling SLF spectra. The observed 15N-13Cα heteronuclear dipolar couplings are: ~0 Hz (pair 1); 200 Hz (pair 2); 374 Hz (pair 3); and 451 Hz (pair 4).
