data_[Na2Ti2Cu4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ti  1.5400  1.4000  0.8517
  Cu  1.9000  1.3500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I-42m]
_cell_length_a [5.3995]
_cell_length_b [5.3995]
_cell_length_c [6.4127]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [121]
_chemical_formula_structural [NaTi(CuO2)2]
_chemical_formula_sum '[Na2 Ti2 Cu4 O8]'
_cell_volume [186.9617]
_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  1.0
  Ti  Ti1  2  0.0000  0.0000  0.5000  1.0
  Cu  Cu2  4  0.0000  0.5000  0.2500  1.0
  O  O3  8  0.1939  0.1939  0.3251  1.0
]