XmlmmCIF equivalent: chem_comp_chir Data items in the CHEM_COMP_CHIR category provide detail about the chiral centers in a chemical component. The atoms bonded to the chiral atom are specified in the CHEM_COMP_CHIR_ATOM category. XmlmmCIF equivalent: chem_comp_chir/atom_config The chiral configuration of the atom that is a chiral center. XmlmmCIF equivalent: chem_comp_chir/atom_id The id of the atom that is a chiral center. This data item is a pointer to _chem_comp_atom.atom_id in the CHEM_COMP_ATOM category. XmlmmCIF equivalent: chem_comp_chir/number_atoms_all The total number of atoms bonded to the atom specified by _chem_comp_chir.atom_id. XmlmmCIF equivalent: chem_comp_chir/number_atoms_nh The number of non-hydrogen atoms bonded to the atom specified by _chem_comp_chir.atom_id. XmlmmCIF equivalent: chem_comp_chir/volume_flag A flag to indicate whether a chiral volume should match the standard value in both magnitude and sign, or in magnitude only. XmlmmCIF equivalent: chem_comp_chir/volume_three The chiral volume, V(c), for chiral centers that involve a chiral atom bonded to three non-hydrogen atoms and one hydrogen atom. V~c~ = V1 * (V2 X V3) V1 = the vector distance from the atom specified by _chem_comp_chir.atom_id to the first atom in the CHEM_COMP_CHIR_ATOM list V2 = the vector distance from the atom specified by _chem_comp_chir.atom_id to the second atom in the CHEM_COMP_CHIR_ATOM list V3 = the vector distance from the atom specified by _chem_comp_chir.atom_id to the third atom in the CHEM_COMP_CHIR_ATOM list * = the vector dot product X = the vector cross product XmlmmCIF equivalent: chem_comp_chir/volume_three_esd The estimated standard deviation of _chem_comp_chir.volume_three. XmlmmCIF equivalent: chem_comp_chir/comp_id This data item is a pointer to _chem_comp.id in the CHEM_COMP category. XmlmmCIF equivalent: chem_comp_chir/id The value of _chem_comp_chir.id must uniquely identify a record in the CHEM_COMP_CHIR list.