loop_
    _pdbx_nonpoly_feature.ordinal
    _pdbx_nonpoly_feature.comp_id
    _pdbx_nonpoly_feature.label_asym_id
    _pdbx_nonpoly_feature.type
    _pdbx_nonpoly_feature.value
    _pdbx_nonpoly_feature.provenance   
    1 SF4 B 'Group charge' 2 Author