$MOPAC group    (relevant if GBASIS=PM3, AM1, or MNDO)
 
     This group affects only semi-empirical jobs, which are
selected in $BASIS by keyword GBASIS.
 
PEPTID = flag for peptide bond correction.
         By default a molecular mechanics-style torsion
         potential term is added for every peptide bond
         linkage found.  The intent is to correct these
         torsions to be closer to planar than they would
         otherwise be in the semi-empirical model.  Here,
         the peptide bond means any
 
                      O       H
                      \\     /
                       C----N
                      /      \
                              X
 
         One such torsion is added for O-C-N-H and one for
         O-C-N-X.  This term is parameterized as in MOPAC6.
         Default=.TRUE.
 
 
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