data_[Na2Sr4Cu4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  Cu  1.9000  1.3500  0.8200
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [8.9058]
_cell_length_b [8.9058]
_cell_length_c [3.7782]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [Na(SrCu)2]
_chemical_formula_sum '[Na2 Sr4 Cu4]'
_cell_volume [299.6595]
_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  0.0000  0.0000  0.0000  1
  Sr  Sr1  4  0.1675  0.3325  0.0000  1
  Cu  Cu2  4  0.1066  0.6066  0.5000  1
]