data_C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.82
_cell_length_b   7.82
_cell_length_c   2.0
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   147.59
_symmetry_Int_Tables_number   1
_chemical_formula_structural   C
_chemical_formula_sum   C12
_cell_volume   65.57
_cell_formula_units_Z   12
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
  C  C0  1  0.72  0.09  0.0  1.0
  C  C1  1  0.65  0.91  0.0  1.0
  C  C2  1  0.72  0.91  0.0  1.0
  C  C3  1  0.65  0.09  0.0  1.0
  C  C4  1  0.89  0.25  0.0  1.0
  C  C5  1  0.47  0.75  0.0  1.0
  C  C6  1  0.47  0.25  0.0  1.0
  C  C7  1  0.89  0.75  0.0  1.0
  C  C8  1  0.91  0.86  0.0  1.0
  C  C9  1  0.46  0.14  0.0  1.0
  C  C10  1  0.91  0.14  0.0  1.0
  C  C11  1  0.46  0.86  0.0  1.0

data_C
_symmetry_space_group_name_H-M   P2/m
_cell_length_a   4.37
_cell_length_b   2.0
_cell_length_c   7.82
_cell_angle_alpha   90.0
_cell_angle_beta   106.21
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   10
_chemical_formula_structural   C
_chemical_formula_sum   C12
_cell_volume   65.57
_cell_formula_units_Z   12
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y, -z'
  4  '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
  C  C0  2  0.09  0.0  0.05  1.0
  C  C1  2  0.09  0.0  0.13  1.0
  C  C2  2  0.14  0.0  0.37  1.0
  C  C3  2  0.14  0.0  0.92  1.0
  C  C4  2  0.25  0.0  0.04  1.0
  C  C5  2  0.25  0.0  0.46  1.0

C C C C C C C C C C C C
C C C C C C C C C C C C 0 3 o o o 0 4 o o o 0 10 o o o 0 11 o - o 1 2 o o o 1 5 o o o 1 10 o + o 1 11 o o o 2 10 o + o 3 11 o - o 4 10 o o o 5 11 o o o 6 9 o o o 7 8 o o o 
C crystallizes in the monoclinic P2/m space group. The structure is zero-dimensional and consists of two acetylene molecules and one pentalene molecule.