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We report here the results on N-acetyl-l-proline-N'-methylamide (Ac-Pro-NHMe) calculated at the HF/6-31+G(d) level with the conductor-like polarizable continuum model (CPCM) of self-consistent reaction field methods to investigate the changes of backbone and prolyl ring along the cis-trans isomerization of the prolyl peptide bond. From the potential energy surface, the barrier to ring flip from the...
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