<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following CIF representation:
data_Li2Br
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.21
_cell_length_b   7.21
_cell_length_c   5.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   149.94
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2Br
_chemical_formula_sum   'Li4 Br2'
_cell_volume   142.47
_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
  Li  Li2  1  0.87  0.71  0.1  1.0
  Li  Li3  1  0.87  0.89  0.1  1.0
  Li  Li4  1  0.87  0.11  0.37  1.0
  Li  Li5  1  0.87  0.29  0.37  1.0
  Br  Br0  1  0.87  0.75  0.1  1.0
  Br  Br1  1  0.87  0.25  0.37  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Li2Br
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.21
_cell_length_b   7.21
_cell_length_c   5.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   149.94
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2Br
_chemical_formula_sum   'Li4 Br2'
_cell_volume   142.47
_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
  Li  Li2  1  0.87  0.71  0.1  1.0
  Li  Li3  1  0.87  0.89  0.1  1.0
  Li  Li4  1  0.87  0.11  0.37  1.0
  Li  Li5  1  0.87  0.29  0.37  1.0
  Br  Br0  1  0.87  0.75  0.1  1.0
  Br  Br1  1  0.87  0.25  0.37  1.0

What is the crystal system of this material?