<|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_BaPtBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.26
_cell_length_b   6.19
_cell_length_c   3.95
_cell_angle_alpha   72.54
_cell_angle_beta   70.48
_cell_angle_gamma   36.97
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaPtBr
_chemical_formula_sum   'Ba1 Pt1 Br1'
_cell_volume   86.54
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.71  0.87  0.07  1.0
  Pt  Pt2  1  0.71  0.87  0.35  1.0
  Br  Br1  1  0.71  0.87  0.71  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_BaPtBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.26
_cell_length_b   6.19
_cell_length_c   3.95
_cell_angle_alpha   72.54
_cell_angle_beta   70.48
_cell_angle_gamma   36.97
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaPtBr
_chemical_formula_sum   'Ba1 Pt1 Br1'
_cell_volume   86.54
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.71  0.87  0.07  1.0
  Pt  Pt2  1  0.71  0.87  0.35  1.0
  Br  Br1  1  0.71  0.87  0.71  1.0

What is the crystal system of this material?