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Item _atom_site.disorder_group

Description

              A code which identifies a group of positionally disordered atom
               sites that are locally simultaneously occupied. Atoms that are
               positionally disordered over two or more sites (e.g. the hydrogen
               atoms of a methyl group that exists in two orientations) can
               be assigned to two or more groups. Sites belonging to the same
               group are simultaneously occupied, but those belonging to
               different groups are not. A minus prefix (e.g. '-1') is used to
               indicate sites disordered about a special position.

               *** This data item would not in general be used in a
               macromolecular data block. ***

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Mandatory Code

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