data_[K4Pm8Cu4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Pm  1.1300  1.8500  1.1100
  Cu  1.9000  1.3500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.5713]
_cell_length_b [11.9955]
_cell_length_c [12.0532]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [KPm2CuO4]
_chemical_formula_sum '[K4 Pm8 Cu4 O16]'
_cell_volume [516.3526]
_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
[
  K  K0  4  0.0000  0.0976  0.7500  1
  Pm  Pm1  8  0.0000  0.3679  0.5610  1
  Cu  Cu2  4  0.0000  0.1779  0.2500  1
  O  O3  8  0.0000  0.2548  0.1005  1
  O  O4  4  0.0000  0.0000  0.0000  1
  O  O5  4  0.0000  0.4214  0.7500  1
]