data_[K4Mg2Cu4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Mg  1.3100  1.5000  0.8600
  Cu  1.9000  1.3500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.4565]
_cell_length_b [3.2621]
_cell_length_c [7.0152]
_cell_angle_alpha [90.0000]
_cell_angle_beta [99.1846]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K2Mg(CuO2)2]
_chemical_formula_sum '[K4 Mg2 Cu4 O8]'
_cell_volume [281.4016]
_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
[
  K  K0  4  0.2364  0.5000  0.2471  1
  Mg  Mg1  2  0.0000  0.5000  0.5000  1
  Cu  Cu2  4  0.0079  0.0000  0.1764  1
  O  O3  4  0.0934  0.0000  0.4222  1
  O  O4  4  0.1138  0.0000  0.0004  1
]