Core dictionary (coreCIF) version 2.4.5
'_atom_site_label_component_0' '_atom_site_label_component_1' '_atom_site_label_component_2' '_atom_site_label_component_3' '_atom_site_label_component_4' '_atom_site_label_component_5' '_atom_site_label_component_6'
Component 0 is normally a code which matches identically with one of the _atom_type_symbol codes. If this is the case, then the rules governing the _atom_type_symbol code apply. If, however, the data item _atom_site_type_symbol is also specified in the atom-site list, component 0 need not match this symbol or adhere to any of the _atom_type_symbol rules. Component 1 is referred to as the "atom number". When component 0 is the atom-type code, it is used to number the sites with the same atom type. This component code must start with at least one digit which is not followed by a + or - sign (to distinguish it from the component 0 rules). Components 2 to 6 contain the identifier, residue, sequence, asymmetry identifier and alternate codes, respectively. These codes may be composed of any characters except an underscore.
Appears in list containing _atom_site_label