Data Item _chem_comp.one_letter_code
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General 
- Item name
- _chem_comp.one_letter_code
- Category name
- chem_comp
- Attribute name
- one_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 one-letter code for
the component. For non-standard polymer components, the
one-letter code for parent component if this exists;
otherwise, the one-letter code should be given as 'X'.
Components that derived from multiple parents components
are described by a sequence of one-letter-codes.
Item Example1
A
Item Example2
B
Item Example3
R
Item Example4
N
Item Example5
D
Item Example6
C
Item Example7
Q
Item Example8
E
Item Example9
Z
Item Example10
G
Item Example11
H
Item Example12
I
Item Example13
L
Item Example14
K
Item Example15
M
Item Example16
F
Item Example17
P
Item Example18
S
Item Example19
T
Item Example20
W
Item Example21
Y
Item Example22
V
Item Example23
U
Item Example24
O
Item Example25
X
Data Type 
- Data type code
- ucode
- Data type detail
- code item types/single words (case insensitive) ...
- Primitive data type code
- uchar
- Regular expression
- [][_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*