loop_
    _pdbx_nonstandard_list.id
    _pdbx_nonstandard_list.label_asym_id
    _pdbx_nonstandard_list.label_seq_num
    _pdbx_nonstandard_list.ins_code
    _pdbx_nonstandard_list.number_atoms_nh
BR     A  3    ?    1
BR     C  27   ?    1
CPT    E  49   ?    3
CPT    F  50   ?    3