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INTERNATIONAL TABLES for CRYSTALLOGRAPHY |
Volume G |
Definition and Exchange of Crystallographic Data |
Definition:
This specifies a unique code for an 'atom site' in a molecule
or fragment. A designated atom site may be occupied by a 'dummy'
atom (see _atom_type).
A special syntax exists for this code which permits a template
molecular fragment to be referred to as an 'atom site', and
for the atom within that template to be identified.
The syntax is
m>n
where m is the code identifying the template fragment (contained
within a save frame) and n is the code matching an _atom_id
value stored within the save frame.
Appears in list as essential element of loop structure
May match subsidiary data name(s)
_bond_id_1
_bond_id_2
_stereo_vertex_id
Type: char
Category: atom
Copyright © 2005 International Union of Crystallography