Protein Data Bank exchange dictionary (pdbx) version 1.0521
The value of _phasing_MIR_der_site.id must uniquely identify each site in each derivative in the PHASING_MIR_DER_SITE list. The atom identifiers need not be unique over all sites in all derivatives; they need only be unique for each site in each derivative. Note that this item need not be a number; it can be any unique identifier.
Mandatory item: yes