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13C-MAS-NMR spectra recorded at 9.4 T at -5°C with a spinning speed of 8 kHz, with 512 scans each. Spectrum a, INEPT excitation; spectrum b, CP/MAS with a contact time of 1 ms; spectrum c, direct excitation with a 90° pulse on 13C; spectrum d, a transverse relaxation filter with a proton dephasing delay of 200 μs followed by a CP transfer of 1 ms.
