XmlmmCIF equivalent: chem_link_bond Data items in the CHEM_LINK_BOND category record details about bonds in a linkage between components in the chemical structure. XmlmmCIF equivalent: chem_link_bond/atom_1_comp_id This data item indicates whether atom 1 is found in the first or the second of the two components connected by the linkage. XmlmmCIF equivalent: chem_link_bond/atom_2_comp_id This data item indicates whether atom 2 is found in the first or the second of the two chemical components connected by the linkage. XmlmmCIF equivalent: chem_link_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_link_bond/value_dist_esd The estimated standard deviation of _chem_link_bond.value_dist_esd. XmlmmCIF equivalent: chem_link_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_link_bond/link_id This data item is a pointer to _chem_link.id in the CHEM_LINK category. XmlmmCIF equivalent: chem_link_bond/atom_id_1 The id of the first of the two atoms that define the bond. As this data item does not point to a specific atom in a specific chemical component, it is not a child in the linkage sense. XmlmmCIF equivalent: chem_link_bond/atom_id_2 The id of the second of the two atoms that define the bond. As this data item does not point to a specific atom in a specific component, it is not a child in the linkage sense.