data_[Na2Mg2Cu2H8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Cu  1.9000  1.3500  0.8200
  H  2.2000  0.2500  0.0000
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [4.8448]
_cell_length_b [4.9868]
_cell_length_c [6.5440]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.2427]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaMgCuH4]
_chemical_formula_sum '[Na2 Mg2 Cu2 H8]'
_cell_volume [150.9974]
_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  0.2847  0.2500  0.0679  1.0
  Mg  Mg1  2  0.2271  0.2500  0.5327  1.0
  Cu  Cu2  2  0.2150  0.7500  0.3184  1.0
  H  H3  4  0.0029  0.0047  0.2799  1.0
  H  H4  2  0.4061  0.7500  0.5659  1.0
  H  H5  2  0.4349  0.7500  0.1746  1.0
]