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Abstract
The 13C dipolar N.M.R. spectrum of 13CH3 14NO2 has been recorded at 25 K. The principal values of the 13C shielding tensor, obtained by a computer fit of the experimental lineshape, are similar to those found in other 13CH3 groups. 14N quadrupolar parameters and direct dipolar couplings are also reported. In fitting the spectrum we find that an effective trace must be added to the dipolar interaction to account for librational motion.