Data Item _chem_comp_atom.alt_atom_id
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General 
- Item name
- _chem_comp_atom.alt_atom_id
- Category name
- chem_comp_atom
- Attribute name
- alt_atom_id
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
- Used in the Chemical Component dictionary
- Yes
Item Description
An alternative identifier for the atom. This data item would be
used in cases where alternative nomenclatures exist for labelling
atoms in a group.
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*