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A 1 H-13 C cross-polarization (CP) GO spectrum obtained with 7.6 kHz MAS and a contact time of 1 ms (67,000 scans, at the top) and a 13 C direct pulse spectrum obtained with 12 kHz MAS and a 90° 13C pulse (10,000 scans). The peak at 101 ppm is caused by five-carbon and six-membered ring lactols.
Adapted from Georgakilas et al. 2012 [174]
