Pregna-1,4,16-triene-3,20-dione
Neng-Qiang Wang; Tie-Jun Wang; Acta Crystallographica Section E 63 (2007) o3659–o3659; doi:10.1107/S1600536807036732

data_2214612
_publ_section_title
;
 Pregna-1,4,16-triene-3,20-dione
;
_journal_coeditor_code           CV2284
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3659
_journal_page_last               o3659
_journal_paper_doi               10.1107/S1600536807036732
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C21 H26 O2'
_chemical_formula_moiety         'C21 H26 O2'
_chemical_formula_sum            'C21 H26 O2'
_chemical_formula_weight         310.42
_chemical_name_systematic
;
Pregna-1,4,16-triene-3,20-dione
;
_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'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.3625(12)
_cell_length_b                   11.745(2)
_cell_length_c                   23.007(4)
_cell_measurement_reflns_used    3759
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      26.93
_cell_measurement_theta_min      3.17
_cell_volume                     1719.3(5)
_computing_cell_refinement       'SAINT (Bruker, 2003)'
_computing_data_collection       'APEX2 (Bruker, ????)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Bruker, 2003)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker SMART APEXII CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0277
_diffrn_reflns_av_sigmaI/netI    0.0269
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            10912
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         1.95
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  0.9988
_exptl_absorpt_correction_T_min  0.9805
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.199
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.146
_refine_diff_density_min         -0.129
_refine_ls_abs_structure_details 'see text'
_refine_ls_extinction_coef       0.0073(16)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     212
_refine_ls_number_reflns         2274
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0517
_refine_ls_R_factor_gt           0.0396
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0456P)^2^+0.2215P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0945
_refine_ls_wR_factor_ref         0.1016
_reflns_number_gt                1871
_reflns_number_total             2274
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            cv2284.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1719.2(5)
_cod_database_code               2214612
_cod_database_fobs_code          2214612