data_RbC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.75
_cell_length_b   2.75
_cell_length_c   11.11
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbC2
_chemical_formula_sum   'Rb2 C4'
_cell_volume   72.52
_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
  Rb  Rb4  1  0.37  0.79  0.33  1.0
  Rb  Rb5  1  0.0  0.59  0.78  1.0
  C  C0  1  0.37  0.79  0.48  1.0
  C  C1  1  0.0  0.59  0.03  1.0
  C  C2  1  0.0  0.59  0.63  1.0
  C  C3  1  0.37  0.79  0.07  1.0

data_RbC2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.75
_cell_length_b   2.75
_cell_length_c   11.11
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   RbC2
_chemical_formula_sum   'Rb2 C4'
_cell_volume   72.52
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.19  0.6  0.28  1.0
  C  C1  2  0.19  0.6  0.02  1.0
  C  C2  2  0.19  0.6  0.43  1.0

Rb Rb C C C C
Rb Rb C C C C 0 2 o o o 1 4 o o o 2 4 o o o 3 5 o o o 