data_[Na4Cu2C4O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  C  2.5500  0.7000  0.3000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [5.7630]
_cell_length_b [8.1500]
_cell_length_c [6.3070]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.5078]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na2Cu(CO3)2]
_chemical_formula_sum '[Na4 Cu2 C4 O12]'
_cell_volume [267.3565]
_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  4  0.3632  0.5927  0.1848  1
  Cu  Cu1  2  0.0000  0.0000  0.0000  1
  C  C2  4  0.1945  0.2318  0.3701  1
  O  O3  4  0.0179  0.7233  0.6190  1
  O  O4  4  0.2142  0.0753  0.3251  1
  O  O5  4  0.3781  0.1688  0.9060  1
]