loop_ _pdbx_virtual_bond.atom_site_id_1 _pdbx_virtual_bond.atom_site_id_2 _pdbx_virtual_bond.model_id _pdbx_virtual_bond.dist _pdbx_virtual_bond.site_symmetry_1 _pdbx_virtual_bond.site_symmetry_2 1 5 1 3.40 1_555 1_555 # - - - - data truncated for brevity - - - -