data_[Rb4C8O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  C  2.5500  0.7000  0.3000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.0067]
_cell_length_b [7.0231]
_cell_length_c [4.3376]
_cell_angle_alpha [90.0000]
_cell_angle_beta [93.2873]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb(CO)2]
_chemical_formula_sum '[Rb4 C8 O8]'
_cell_volume [365.1617]
_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
[
  Rb  Rb0  4  0.1678  0.5000  0.7006  1
  C  C1  8  0.0536  0.1054  0.0935  1
  O  O2  8  0.1190  0.2324  0.2044  1
]