Macromolecular dictionary (mmCIF) version 2.0.09
_geom_torsion.atom_site_id_2
Name:'_geom_torsion.atom_site_id_2'
Definition:
The identifier of the second of the four atom sites that define the torsion angle. This data item is a pointer to _atom_site.id in the ATOM_SITE category.
Mandatory item: yes
Alias:_geom_torsion_atom_site_label_2 (cif_core.dic version 2.0.1)