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1H (a) and 13C (b) NMR spectra of a CD3OD solution (0.6 mL) consisting of 1 (2 mg), C (3.1 μL), and pyridine-d5 (0.75 μL) obtained using a modified OPSY sequence in which the double quantum coherence originating from the 2IkzSz starting state (Ik are 1H and S is 13C) was selected.
