data_SnC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.2
_cell_length_b   6.2
_cell_length_c   6.2
_cell_angle_alpha   153.12
_cell_angle_beta   127.42
_cell_angle_gamma   60.03
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnC2
_chemical_formula_sum   'Sn2 C4'
_cell_volume   84.79
_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
  Sn  Sn4  1  0.0  0.37  0.53  1.0
  Sn  Sn5  1  0.44  0.37  0.84  1.0
  C  C0  1  0.44  0.63  0.43  1.0
  C  C1  1  0.0  0.12  0.94  1.0
  C  C2  1  0.44  0.63  0.07  1.0
  C  C3  1  0.0  0.12  0.3  1.0

data_SnC2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.88
_cell_length_b   5.49
_cell_length_c   6.2
_cell_angle_alpha   116.29
_cell_angle_beta   103.44
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SnC2
_chemical_formula_sum   'Sn2 C4'
_cell_volume   84.79
_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
  Sn  Sn0  2  0.5  0.16  0.94  1.0
  C  C1  2  0.24  0.13  0.91  1.0
  C  C2  2  0.24  0.49  0.27  1.0

Sn Sn C C C C