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
A code that uniquely identifies the chemical component from all other chemical
components in the entry.
Data Type 
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Child Data Items 
- _angle.comp_id_1
- _angle.comp_id_2
- _angle.comp_id_3
- _angular_order_param.comp_id
- _assembly_segment.comp_id
- _assigned_peak_chem_shift.comp_id
- _assigned_spectral_transition.comp_id
- _atom.comp_id
- _atom.pdb_comp_id
- _atom_chem_shift.comp_id
- _atom_nomenclature.comp_id
- _atom_site.label_comp_id
- _atom_site.pdbx_label_comp_id
- _author_annotation.comp_id
- _auto_relaxation.comp_id
- _binding_result.atm_obs_comp_id
- _bond.comp_id_1
- _bond.comp_id_2
- _bond_annotation.comp_id_1
- _bond_annotation.comp_id_2
- _ca_cb_constraint.comp_id_1
- _ca_cb_constraint.comp_id_2
- _ca_cb_constraint.comp_id_3
- _ca_cb_constraint.comp_id_4
- _ca_cb_constraint.comp_id_5
- _characteristic.comp_id
- _chem_comp_angle.comp_id
- _chem_comp_assembly.comp_id
- _chem_comp_atom.comp_id
- _chem_comp_bio_function.comp_id
- _chem_comp_bond.comp_id
- _chem_comp_citation.comp_id
- _chem_comp_common_name.comp_id
- _chem_comp_db_link.comp_id
- _chem_comp_descriptor.comp_id
- _chem_comp_identifier.comp_id
- _chem_comp_keyword.comp_id
- _chem_comp_smiles.comp_id
- _chem_comp_systematic_name.comp_id
- _chem_comp_tor.comp_id
- _chem_struct_descriptor.comp_id
- _chemical_rate.comp_id
- _coupling_constant.comp_id_1
- _coupling_constant.comp_id_2
- _cross_correlation_d_csa.csa_comp_id_1
- _cross_correlation_d_csa.csa_comp_id_2
- _cross_correlation_d_csa.dipole_comp_id_1
- _cross_correlation_d_csa.dipole_comp_id_2
- _cross_correlation_dd.dipole_1_comp_id_1
- _cross_correlation_dd.dipole_1_comp_id_2
- _cross_correlation_dd.dipole_2_comp_id_1
- _cross_correlation_dd.dipole_2_comp_id_2
- _cs_anisotropy.comp_id
- _d_h_fractionation_factor.comp_id
- _deduced_h_bond.h_atom_comp_id
- _deduced_h_bond.heavy_atom_comp_id_1
- _deduced_h_bond.heavy_atom_comp_id_2
- _deduced_secd_struct_feature.comp_id
- _dipolar_coupling.comp_id_1
- _dipolar_coupling.comp_id_2
- _dipole_dipole_relax.comp_id_1
- _dipole_dipole_relax.comp_id_2
- _dist_constraint.comp_id
- _entity.nonpolymer_comp_id
- _entity_atom_list.comp_id
- _entity_bond.comp_id_1
- _entity_bond.comp_id_2
- _entity_chem_comp_deleted_atom.comp_id
- _entity_comp_index.comp_id
- _entity_comp_index_alt.comp_id
- _entity_deleted_atom.comp_id
- _floating_chirality.comp_id_1
- _floating_chirality.comp_id_2
- _gen_dist_constraint.comp_id_1
- _gen_dist_constraint.comp_id_2
- _h_chem_shift_constraint.comp_id
- _h_exch_protection_factor.comp_id
- _h_exch_rate.comp_id
- _heteronucl_noe.comp_id_1
- _heteronucl_noe.comp_id_2
- _homonucl_noe.comp_id_1
- _homonucl_noe.comp_id_2
- _interatomic_dist.comp_id_1
- _interatomic_dist.comp_id_2
- _isotope_effect.comp_id
- _isotope_label_pattern.comp_id
- _j_three_bond_constraint.comp_id_1
- _j_three_bond_constraint.comp_id_2
- _j_three_bond_constraint.comp_id_3
- _j_three_bond_constraint.comp_id_4
- _mol_interaction_chem_shift.comp_id
- _ms_chrom_ion_annotation.comp_id
- _mz_precursor_ion_annotation.comp_id
- _mz_product_ion_annotation.comp_id
- _order_param.comp_id
- _other_data.comp_id
- _pdbx_chem_comp_feature.comp_id
- _pdbx_nonpoly_scheme.comp_id
- _pdbx_poly_seq_scheme.comp_id
- _ph_titr_result.atm_obs_comp_id
- _ph_titr_result.atm_titr_comp_id
- _rdc.comp_id_1
- _rdc.comp_id_2
- _rdc_constraint.comp_id_1
- _rdc_constraint.comp_id_2
- _rep_conf.comp_id
- _resonance_assignment.comp_id
- _sample_component_atom_isotope.comp_id
- _spectral_density.comp_id
- _spin_system.comp_id
- _structure_interaction.comp_id_1
- _structure_interaction.comp_id_2
- _t1.comp_id
- _t1rho.comp_id
- _t2.comp_id
- _tensor.comp_id
- _terminal_residue.comp_id
- _tertiary_struct.comp_id
- _theoretical_chem_shift.comp_id
- _torsion_angle.comp_id_1
- _torsion_angle.comp_id_2
- _torsion_angle.comp_id_3
- _torsion_angle.comp_id_4
- _torsion_angle_constraint.comp_id_1
- _torsion_angle_constraint.comp_id_2
- _torsion_angle_constraint.comp_id_3
- _torsion_angle_constraint.comp_id_4