6β-Methyl-3,20-dioxopregn-4-en-17-yl acetate
Chen, Longran; Liu, Xuefen; Yang, Peng; Acta Crystallographica Section E 68 (2012) o997–; doi:10.1107/S1600536812008665

data_2234309
_publ_section_title
;
 6\b-Methyl-3,20-dioxopregn-4-en-17-yl acetate
;
_journal_coeditor_code           LD2047
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o997
_journal_paper_doi               10.1107/S1600536812008665
_journal_volume                  68
_journal_year                    2012
_chemical_formula_iupac          'C24 H34 O4'
_chemical_formula_moiety         'C24 H34 O4'
_chemical_formula_sum            'C24 H34 O4'
_chemical_formula_weight         386.51
_chemical_name_systematic
;
6\b-Methyl-3,20-dioxopregn-4-en-17-yl acetate
;
_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                   10.0411(3)
_cell_length_b                   11.3123(3)
_cell_length_c                   18.5549(7)
_cell_measurement_reflns_used    14918
_cell_measurement_temperature    296.0(10)
_cell_measurement_theta_max      27.4
_cell_measurement_theta_min      3.0
_cell_volume                     2107.61(12)
_computing_cell_refinement       'PROCESS-AUTO (Rigaku, 2006)'
_computing_data_collection       'PROCESS-AUTO (Rigaku, 2006)'
_computing_data_reduction        'CrystalStructure (Rigaku, 2007)'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296.0(10)
_diffrn_detector_area_resol_mean 10.00
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Rigaku R-AXIS RAPID/ZJUG'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rolling anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0346
_diffrn_reflns_av_sigmaI/netI    0.0214
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            20014
_diffrn_reflns_theta_full        27.44
_diffrn_reflns_theta_max         27.44
_diffrn_reflns_theta_min         2.99
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  0.9753
_exptl_absorpt_correction_T_min  0.9460
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(ABSCOR; Higashi, 1995)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.218
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       chunk
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.52
_exptl_crystal_size_min          0.31
_refine_diff_density_max         0.170
_refine_diff_density_min         -0.163
_refine_ls_extinction_coef       0.0057(12)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.000
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         2679
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.000
_refine_ls_R_factor_all          0.0533
_refine_ls_R_factor_gt           0.0393
_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^)+(0.0441P)^2^+0.5695P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0901
_refine_ls_wR_factor_ref         0.1024
_reflns_number_gt                2108
_reflns_number_total             2679
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            ld2047.cif
_cod_data_source_block           I
_cod_database_code               2234309
_cod_database_fobs_code          2234309