Macromolecular dictionary (mmCIF) version 2.0.09
_geom_torsion.atom_site_auth_atom_id_1
Name:'_geom_torsion.atom_site_auth_atom_id_1'
Definition:
An optional identifier of the first of the four atom sites that define the torsion angle. This data item is a pointer to _atom_site.auth_atom_id in the ATOM_SITE category.
Mandatory item: no