loop_
    _pdbx_nonpoly_feature_evidence.ordinal
    _pdbx_nonpoly_feature_evidence.comp_id
    _pdbx_nonpoly_feature_evidence.label_asym_id
    _pdbx_nonpoly_feature_evidence.type
    _pdbx_nonpoly_feature_evidence.experimental_support
    _pdbx_nonpoly_feature_evidence.details
    1 SF4 B 'Group charge' 'Electron paramagnetic resonance spectrometry' ?