data_[Na2Np1Ag1Br8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Np  1.3600  1.7500  1.0000
  Ag  1.9300  1.6000  1.0867
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [6.6450]
_cell_length_b [9.1831]
_cell_length_c [6.9116]
_cell_angle_alpha [90.0000]
_cell_angle_beta [96.7505]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [Na2NpAgBr8]
_chemical_formula_sum '[Na2 Np1 Ag1 Br8]'
_cell_volume [418.8296]
_cell_formula_units_Z [1]
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  0.5000  0.2709  0.5000  1
  Np  Np1  1  0.0000  0.0000  0.0000  1
  Ag  Ag2  1  0.0000  0.5000  0.0000  1
  Br  Br3  4  0.2177  0.2104  0.8497  1
  Br  Br4  2  0.2591  0.5000  0.3053  1
  Br  Br5  2  0.2643  0.0000  0.3336  1
]