Diosbulbin B, a constituent of <i>Dioscorea pentaphylla</i>
Singh, Amarjit; Parmar, Virinder S.; Errington, William; Howarth, Oliver W.; Lawrie, Stephen; Acta Crystallographica Section C 55 (1999) 559–561; doi:10.1107/S0108270198014978

data_2008323
_publ_section_title
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 Diosbulbin B, a constituent of <i>Dioscorea pentaphylla</i>
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_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              559
_journal_page_last               561
_journal_paper_doi               10.1107/S0108270198014978
_journal_volume                  55
_journal_year                    1999
_chemical_formula_sum            'C19 H20 O6'
_chemical_formula_weight         344.35
_chemical_name_common            Diosbulbin-B
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.915(4)
_cell_length_b                   10.623(4)
_cell_length_c                   17.243(5)
_cell_measurement_reflns_used    4018
_cell_measurement_temperature    190(2)
_cell_measurement_theta_max      24.99
_cell_measurement_theta_min      2.25
_cell_volume                     1633.0(11)
_computing_cell_refinement       'SAINT (Siemens, 1995)'
_computing_data_collection       'SMART (Siemens, 1994)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL/PC
_computing_publication_material  SHELXTL/PC
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXTL/PC (Sheldrick, 1994)'
_diffrn_ambient_temperature      190(2)
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Siemens SMART CCD area-detector'
_diffrn_measurement_method       \w-scans
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.057
_diffrn_reflns_av_sigmaI/netI    0.050
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            8492
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.25
_diffrn_standards_decay_%        nil
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.401
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.19
_refine_diff_density_min         -0.18
_refine_ls_abs_structure_details 'Flack (1983)'
_refine_ls_abs_structure_Flack   0.3(13)
_refine_ls_extinction_coef       0.0090(12)
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.106
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         2872
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.106
_refine_ls_R_factor_all          0.064
_refine_ls_R_factor_gt           0.044
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0313P)^2^+0.5866P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.097
_reflns_number_gt                2376
_reflns_number_total             2872
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bm1291.cif
_cod_data_source_block           asj
_cod_depositor_comments
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The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0313P)^2^+0.5866P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0313P)^2^+0.5866P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_original_cell_volume        1633.0(10)
_cod_database_code               2008323
_cod_database_fobs_code          2008323