In the CP-MAS 13C NMR spectrum of polycrystalline L-leucine, the splitting of the resonance from the β-carbon can be assigned to site differences in the P21 unit cell, and not to long-range residual dipolar coupling between 14N and 13C.
M. D. Hollingsworth and N. Cyr, J. Chem. Soc., Chem. Commun., 1990, 578 DOI: 10.1039/C39900000578
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