data_[Cu4Ru8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cu  1.9000  1.3500  0.8200
  Ru  2.2000  1.3000  0.6610
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [5.3499]
_cell_length_b [3.7409]
_cell_length_c [8.0663]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [CuRu2]
_chemical_formula_sum '[Cu4 Ru8]'
_cell_volume [161.4369]
_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
[
  Cu  Cu0  4  0.1140  0.2500  0.9156  1
  Ru  Ru1  4  0.1205  0.2500  0.5830  1
  Ru  Ru2  4  0.1336  0.2500  0.2575  1
]