Data Item _chem_comp.three_letter_code
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General 
- Item name
- _chem_comp.three_letter_code
- Category name
- chem_comp
- Attribute name
- three_letter_code
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
- Used in the Chemical Component dictionary
- Yes
Item Description
For standard polymer components, the three-letter code for the component.
If there is not a standard three-letter code for this component, or if this is
a non-polymer component, the three-letter code should be given as 'UNK'. This
code may be preceded by a '+' character to indicate that the component is a modification
of a standard component.
Data Type 
- Data type code
- uchar3
- Data type detail
- data item for 3 character codes
- Primitive data type code
- uchar
- Regular expression
- [+]?[A-Za-z0-9]?[A-Za-z0-9][A-Za-z0-9]