data_[Na4Ac8Se6N4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ac  1.1000  1.9500  1.2600
  Se  2.5500  1.1500  1.0133
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [5.1279]
_cell_length_b [5.1279]
_cell_length_c [23.7894]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Na2Ac4Se3N2]
_chemical_formula_sum '[Na4 Ac8 Se6 N4]'
_cell_volume [625.5382]
_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  4  0.0000  0.0000  0.2945  1
  Ac  Ac1  8  0.0000  0.5000  0.0894  1
  Se  Se2  4  0.0000  0.0000  0.1739  1
  Se  Se3  2  0.0000  0.0000  0.0000  1
  N  N4  4  0.0000  0.0000  0.3953  1
]