<|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_Rb4CO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.53
_cell_length_b   5.53
_cell_length_c   5.53
_cell_angle_alpha   90.4
_cell_angle_beta   90.4
_cell_angle_gamma   90.4
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Rb4CO4
_chemical_formula_sum   'Rb4 C1 O4'
_cell_volume   168.72
_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
  Rb  Rb5  1  0.0  0.0  0.85  1.0
  Rb  Rb6  1  0.85  0.07  0.1  1.0
  Rb  Rb7  1  0.75  0.84  0.1  1.0
  Rb  Rb8  1  0.4  0.09  0.1  1.0
  C  C0  1  0.0  0.0  0.58  1.0
  O  O1  1  0.0  0.0  0.02  1.0
  O  O2  1  0.06  0.64  0.1  1.0
  O  O3  1  0.79  0.63  0.1  1.0
  O  O4  1  0.15  0.73  0.1  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Rb4CO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.53
_cell_length_b   5.53
_cell_length_c   5.53
_cell_angle_alpha   90.4
_cell_angle_beta   90.4
_cell_angle_gamma   90.4
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Rb4CO4
_chemical_formula_sum   'Rb4 C1 O4'
_cell_volume   168.72
_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
  Rb  Rb5  1  0.0  0.0  0.85  1.0
  Rb  Rb6  1  0.85  0.07  0.1  1.0
  Rb  Rb7  1  0.75  0.84  0.1  1.0
  Rb  Rb8  1  0.4  0.09  0.1  1.0
  C  C0  1  0.0  0.0  0.58  1.0
  O  O1  1  0.0  0.0  0.02  1.0
  O  O2  1  0.06  0.64  0.1  1.0
  O  O3  1  0.79  0.63  0.1  1.0
  O  O4  1  0.15  0.73  0.1  1.0

What is the crystal system of this material?