loop_ _pdbx_virtual_angle.atom_site_id_1 _pdbx_virtual_angle.atom_site_id_2 _pdbx_virtual_angle.atom_site_id_3 _pdbx_virtual_angle.model_id _pdbx_virtual_angle.value _pdbx_virtual_angle.site_symmetry_1 _pdbx_virtual_angle.site_symmetry_2 _pdbx_virtual_angle.site_symmetry_3 1 15 20 1 111.6 1_555 1_555 1_555 # - - - - data truncated for brevity - - - -