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 common three-letter code for
the component. Non-standard polymer components and non-polymer
components are also assigned three-letter-codes.
For ambiguous polymer components three-letter code should
be given as 'UNK'. Ambiguous ions are assigned the code 'UNX'.
Ambiguous non-polymer components are assigned the code 'UNL'.
Item Example1
ALA
Item Example2
ARG
Item Example3
ASN
Item Example4
ASP
Item Example5
ASX
Item Example6
CYS
Item Example7
GLN
Item Example8
GLU
Item Example9
GLY
Item Example10
GLX
Item Example11
HIS
Item Example12
ILE
Item Example13
LEU
Item Example14
LYS
Item Example15
MET
Item Example16
PHE
Item Example17
PRO
Item Example18
SER
Item Example19
THR
Item Example20
TRP
Item Example21
TYR
Item Example22
VAL
Item Example23
1MA
Item Example24
5MC
Item Example25
OMC
Item Example26
1MG
Item Example27
2MG
Item Example28
M2G
Item Example29
7MG
Item Example30
0MG
Item Example31
H2U
Item Example32
5MU
Item Example33
PSU
Item Example34
ACE
Item Example35
FOR
Item Example36
HOH
Item Example37
UNK
Data Type 
- Data type code
- uchar5
- Data type detail
- data item for 5 character codes
- Primitive data type code
- uchar
- Regular expression
- [+]?[A-Za-z0-9][A-Za-z0-9]?[A-Za-z0-9]?[A-Za-z0-9]?[A-Za-z0-9]?