Data Item _chem_comp.id
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General 
- Item name
- _chem_comp.id
- Category name
- chem_comp
- Attribute name
- id
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 100.0 % of entries
- Used in the Chemical Component dictionary
- Yes
Item Description
The value of _chem_comp.id must uniquely identify each item in
the CHEM_COMP list.
For protein polymer entities, this is the three-letter code for
the amino acid.
For nucleic acid polymer entities, this is the one-letter code
for the base.
Item Example1
ALA
Item Example2
VAL
Item Example3
DG
Item Example4
C
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*|+-]*
Child Data Items 
- _atom_site.label_comp_id
- _chem_comp_angle.comp_id
- _chem_comp_atom.comp_id
- _chem_comp_bond.comp_id
- _chem_comp_chir.comp_id
- _chem_comp_chir_atom.comp_id
- _chem_comp_plane.comp_id
- _chem_comp_plane_atom.comp_id
- _chem_comp_tor.comp_id
- _chem_comp_tor_value.comp_id
- _entity_poly_seq.mon_id
- _pdbx_chem_comp_atom_related.comp_id
- _pdbx_chem_comp_audit.comp_id
- _pdbx_chem_comp_descriptor.comp_id
- _pdbx_chem_comp_feature.comp_id
- _pdbx_chem_comp_identifier.comp_id
- _pdbx_chem_comp_import.comp_id
- _pdbx_chem_comp_nonstandard.comp_id
- _pdbx_chem_comp_pcm.comp_id
- _pdbx_chem_comp_related.comp_id
- _pdbx_chem_comp_subcomponent_entity_list.parent_comp_id
- _pdbx_chem_comp_synonyms.comp_id
- _pdbx_distant_solvent_atoms.auth_comp_id
- _pdbx_distant_solvent_atoms.label_comp_id
- _pdbx_entity_branch_list.comp_id
- _pdbx_entity_nonpoly.comp_id
- _pdbx_struct_special_symmetry.auth_comp_id
- _pdbx_struct_special_symmetry.label_comp_id
- _pdbx_unobs_or_zero_occ_atoms.auth_comp_id
- _pdbx_unobs_or_zero_occ_atoms.label_comp_id
- _pdbx_unobs_or_zero_occ_residues.auth_comp_id
- _pdbx_unobs_or_zero_occ_residues.label_comp_id