data_ZnC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.46
_cell_length_b   3.46
_cell_length_c   6.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   137.07
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ZnC
_chemical_formula_sum   'Zn2 C2'
_cell_volume   56.3
_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
  Zn  Zn2  1  0.27  0.61  0.55  1.0
  Zn  Zn3  1  0.27  0.39  0.34  1.0
  C  C0  1  0.27  0.61  0.59  1.0
  C  C1  1  0.27  0.39  0.3  1.0

data_ZnC
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.53
_cell_length_b   3.46
_cell_length_c   6.89
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   111.47
_symmetry_Int_Tables_number   2
_chemical_formula_structural   ZnC
_chemical_formula_sum   'Zn2 C2'
_cell_volume   56.3
_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
  Zn  Zn0  2  0.39  0.39  0.1  1.0
  C  C1  2  0.39  0.39  0.15  1.0

Zn Zn C C