Enhancing the Hygroscopic Stability ofS-Oxiracetam via Pharmaceutical Cocrystals
Wang, Zi-Zhou; Chen, Jia-Mei; Lu, Tong-Bu; Crystal Growth & Design 12 (2012) 4562–; doi:10.1021/cg300757k

data_4506722
_publ_section_title
;
 Enhancing the Hygroscopic Stability ofS-Oxiracetam via Pharmaceutical
 Cocrystals
;
_journal_issue                   9
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              4562
_journal_paper_doi               10.1021/cg300757k
_journal_volume                  12
_journal_year                    2012
_chemical_absolute_configuration rmad
_chemical_formula_sum            'C13 H16 N2 O8'
_chemical_formula_weight         328.28
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           4
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 103.0525(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.46022(13)
_cell_length_b                   8.87772(8)
_cell_length_c                   12.73088(12)
_cell_measurement_temperature    100(2)
_cell_volume                     1371.88(2)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0283
_diffrn_reflns_av_sigmaI/netI    0.0181
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            24843
_diffrn_reflns_theta_full        71.82
_diffrn_reflns_theta_max         71.82
_diffrn_reflns_theta_min         3.56
_exptl_absorpt_coefficient_mu    1.154
_exptl_absorpt_correction_T_max  0.8021
_exptl_absorpt_correction_T_min  0.7234
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.589
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             688
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.788
_refine_diff_density_min         -0.341
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.03(14)
_refine_ls_extinction_coef       0.0027(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     432
_refine_ls_number_reflns         5278
_refine_ls_number_restraints     23
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0368
_refine_ls_R_factor_gt           0.0349
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0563P)^2^+0.5897P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0927
_refine_ls_wR_factor_ref         0.0954
_reflns_number_gt                5070
_reflns_number_total             5278
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg300757k_si_002.cif
_cod_data_source_block           galso
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               4506722