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     { IMPROPER } [DELETE] repeat(iupac iupac iupac iupac)
     {  IMPHI   }

The IMPROPER command, and its synonym, IMPMI, are used to specify improper dihedrals in a residue. Each quadruple of iupac names specifies an improper dihedral with the first atom is the atom being kept planar or chiral. As with the proper dihedral, four atom specifications may be used and when an improper dihedral is repeated, multiple parameter values will be sought.

There does not exist any automatic mechanism for constructing improper dihedrals. It is entirely a function of the parameters used to build the residues.

The DELETE option causes CONGEN to delete the named improper dihedral angles from the current residue. This option is useful when the COPY command is used.