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13C-detection of the one-pulse FID for (*CH3)2*CD*CD(*NH2)*COOH valine in D2O, where *C represents 13C labeling. A, C) Direct detection of the 13C-FID and FT-spectrum acquired with no decoupling. B, D) Direct detection of 13C-FID and FT-spectrum acquired with simultaneous 2H and 15N decoupling.
