`ImproperTorsionKey`

pydantic model openff.interchange.models.ImproperTorsionKey[source]

A unique identifier of the atoms associated in an improper torsion potential.

The central atom is the second atom in the atom_indices tuple, or accessible via get_central_atom_index.

get_central_atom_index() → int[source]: Get the index of the central atom of this improper torsion.