Data Item _pdbx_validate_polymer_linkage.label_alt_id_2
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General 
- Item name
- _pdbx_validate_polymer_linkage.label_alt_id_2
- Category name
- pdbx_validate_polymer_linkage
- Attribute name
- label_alt_id_2
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
An optional identifier of the second of the two atoms that
define the linkage.
This data item is a pointer to _atom_site.label_alt_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*|+-]*
