Data Item _geom_torsion.atom_site_id_4
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General 
- Item name
- _geom_torsion.atom_site_id_4
- Category name
- geom_torsion
- Attribute name
- atom_site_id_4
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
The identifier of the fourth 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.
Data Type 
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Parent Data Items 
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _geom_torsion_atom_site_label_4 | cif_core.dic | 2.0.1 |