data_[Na4Cu4Sb4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [4.5374]
_cell_length_b [7.4766]
_cell_length_c [7.8364]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [NaCuSb]
_chemical_formula_sum '[Na4 Cu4 Sb4]'
_cell_volume [265.8417]
_cell_formula_units_Z [4]
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  0.0000  0.0000  0.0954  1
  Na  Na1  2  0.0000  0.5000  0.1627  1
  Cu  Cu2  4  0.0000  0.2760  0.7938  1
  Sb  Sb3  4  0.0000  0.2129  0.4622  1
]