_pdbx_nmr_chem_shift_reference.carbon_shifts_flag ?
_pdbx_nmr_chem_shift_reference.details "External DSS sample"
_pdbx_nmr_chem_shift_reference.entry_id 1ABC
_pdbx_nmr_chem_shift_reference.id 1
_pdbx_nmr_chem_shift_reference.label chemical_shift_reference_