data_AsC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.79
_cell_length_b   5.79
_cell_length_c   5.89
_cell_angle_alpha   120.15
_cell_angle_beta   120.15
_cell_angle_gamma   28.21
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AsC2
_chemical_formula_sum   'As2 C4'
_cell_volume   79.82
_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
  As  As0  1  0.36  0.0  0.16  1.0
  As  As1  1  0.82  0.0  0.88  1.0
  C  C2  1  0.08  0.0  0.29  1.0
  C  C3  1  0.2  0.0  0.95  1.0
  C  C4  1  0.97  0.0  0.1  1.0
  C  C5  1  0.1  0.0  0.76  1.0

data_AsC2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.82
_cell_length_b   5.79
_cell_length_c   5.83
_cell_angle_alpha   60.98
_cell_angle_beta   76.0
_cell_angle_gamma   75.9
_symmetry_Int_Tables_number   2
_chemical_formula_structural   AsC2
_chemical_formula_sum   'As2 C4'
_cell_volume   79.82
_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
  As  As0  2  0.0  0.13  0.14  1.0
  C  C1  2  0.0  0.19  0.93  1.0
  C  C2  2  0.0  0.28  0.73  1.0

As As C C C C