XmlmmCIF equivalent: chem_comp_bond Data items in the CHEM_COMP_BOND category record details about the bonds between atoms in a chemical component. Target values may be specified as bond orders, as a distance between the two atoms, or both. XmlmmCIF equivalent: chem_comp_bond/value_dist The value that should be taken as the target for the chemical bond associated with the specified atoms, expressed as a distance. XmlmmCIF equivalent: chem_comp_bond/value_dist_esd The estimated standard deviation of _chem_comp_bond.value_dist. XmlmmCIF equivalent: chem_comp_bond/value_order The value that should be taken as the target for the chemical bond associated with the specified atoms, expressed as a bond order. XmlmmCIF equivalent: chem_comp_bond/comp_id This data item is a pointer to _chem_comp.id in the CHEM_COMP category. XmlmmCIF equivalent: chem_comp_bond/atom_id_1 The id of the first of the two atoms that define the bond. This data item is a pointer to _chem_comp_atom.atom_id in the CHEM_COMP_ATOM category. XmlmmCIF equivalent: chem_comp_bond/atom_id_2 The id of the second of the two atoms that define the bond. This data item is a pointer to _chem_comp_atom.atom_id in the CHEM_COMP_ATOM category.