Color polymorphs of aldose reductase inhibitor epalrestat: configurational, conformational and synthon differences.
Swapna, Battini; Suresh, Kuthuru; Nangia, Ashwini; Chemical communications (Cambridge, England) 52 (2016) 4037–4040; doi:10.1039/c6cc00697c

data_7118731
_publ_section_title
;
 Color polymorphs of aldose reductase inhibitor epalrestat:
 configurational, conformational and synthon differences.
;
_journal_issue                   21
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              4037
_journal_page_last               4040
_journal_paper_doi               10.1039/c6cc00697c
_journal_volume                  52
_journal_year                    2016
_chemical_compound_source        synthetic
_chemical_formula_moiety         'C15 H13 N O3 S2'
_chemical_formula_sum            'C15 H13 N O3 S2'
_chemical_formula_weight         319.38
_chemical_melting_point          495.39
_chemical_name_common            Epalrestat
_chemical_name_systematic
; 
 5-[(1Z, 2E)-2-methyl-3-phenylpropenylidene]-4-oxo2-thioxo-3-thiazolidineacetic acid  
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2016-01-20 deposited with the CCDC.
2016-02-09 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 98.364(8)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.7831(13)
_cell_length_b                   5.6288(5)
_cell_length_c                   18.2621(16)
_cell_measurement_reflns_used    1710
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      27.4090
_cell_measurement_theta_min      3.8780
_cell_volume                     1503.4(2)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.30a (release 13-01-2014 CrysAlis171 .NET)
(compiled Jan 13 2014,18:40:09)
;
_computing_data_collection
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CrysAlisPro, Agilent Technologies,
Version 1.171.37.30a (release 13-01-2014 CrysAlis171 .NET)
(compiled Jan 13 2014,18:40:09)
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_computing_data_reduction
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CrysAlisPro, Agilent Technologies,
Version 1.171.37.30a (release 13-01-2014 CrysAlis171 .NET)
(compiled Jan 13 2014,18:40:09)
;
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Xcalibur, Eos, Gemini'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0263
_diffrn_reflns_av_unetI/netI     0.0378
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            6015
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.027
_diffrn_reflns_theta_max         25.027
_diffrn_reflns_theta_min         2.785
_exptl_absorpt_coefficient_mu    0.362
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.82239
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.30a (release 13-01-2014 CrysAlis171 .NET)
(compiled Jan 13 2014,18:40:09)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.411
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             664
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: nitromethane '
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.168
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         2654
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0619
_refine_ls_R_factor_gt           0.0427
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0392P)^2^+0.4291P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0907
_refine_ls_wR_factor_ref         0.0996
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1989
_reflns_number_total             2654
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6cc00697c2.cif
_cod_data_source_block           EPR-form-III
_cod_depositor_comments
'Adding full bibliography for 7118731--7118734.cif.'
_cod_database_code               7118731
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              46429
_shelx_hkl_checksum              94313