data_[Na2N2O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  N  3.0400  0.6500  0.6300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-1]
_cell_length_a [3.8629]
_cell_length_b [5.3198]
_cell_length_c [5.5488]
_cell_angle_alpha [89.7936]
_cell_angle_beta [86.5372]
_cell_angle_gamma [89.4449]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [NaNO2]
_chemical_formula_sum '[Na2 N2 O4]'
_cell_volume [113.8141]
_cell_formula_units_Z [2]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  Na  Na0  2  0.2581  0.2497  0.7920  1.0
  N  N1  2  0.2555  0.2439  0.3404  1.0
  O  O2  2  0.2398  0.0574  0.1985  1.0
  O  O3  2  0.2469  0.4578  0.2383  1.0
]