Data items in the STRUCT_CONN_TYPE category record details about the criteria used to identify interactions between portions of the structure.
loop_ _struct_conn_type.id _struct_conn_type.criteria _struct_conn_type.reference saltbr 'negative to positive distance > 2.5 \%A, < 3.2 \%A' . hydrog 'NO distance > 2.5\%A, < 3.5\%A, NOC angle < 120 degrees' .