Data items in the STRUCT_NCS_ENS_GEN category list domains related by a noncrystallographic symmetry operation and identify the operator.
_struct_ncs_ens_gen.dom_id_1 d1 _struct_ncs_ens_gen.dom_id_2 d2 _struct_ncs_ens_gen.ens_id en1 _struct_ncs_ens_gen.oper_id 1