data_K2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.2
_cell_length_b   8.2
_cell_length_c   4.28
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   134.39
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2C
_chemical_formula_sum   'K4 C2'
_cell_volume   205.75
_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
  K  K2  1  0.0  0.0  0.0  1.0
  K  K3  1  0.18  0.0  0.14  1.0
  K  K4  1  0.18  0.98  0.14  1.0
  K  K5  1  0.18  0.02  0.14  1.0
  C  C0  1  0.18  0.94  0.0  1.0
  C  C1  1  0.18  0.06  0.0  1.0

data_K2C
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.28
_cell_length_b   6.35
_cell_length_c   8.2
_cell_angle_alpha   112.81
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2C
_chemical_formula_sum   'K4 C2'
_cell_volume   205.75
_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
  K  K0  1  0.0  0.0  0.0  1.0
  K  K1  1  0.14  0.0  0.18  1.0
  K  K2  1  0.14  0.02  0.19  1.0
  K  K3  1  0.14  0.98  0.16  1.0
  C  C4  1  0.0  0.06  0.23  1.0
  C  C5  1  0.0  0.94  0.12  1.0

K K K K C C