Macromolecular dictionary (mmCIF) version 2.0.09
_geom_torsion.atom_site_label_alt_id_2
Name:'_geom_torsion.atom_site_label_alt_id_2'
Definition:
An optional identifier of the second of the four atom sites that define the torsion angle. This data item is a pointer to _atom_site.label_alt_id in the ATOM_SITE category.
Mandatory item: no