8α,9α-Epoxy-7-oxoroyleanon
Li Wu; Yang Lu; Qi-Tai Zheng; Xiao-Li Li; Qin-Shi Zhao; Acta Crystallographica Section E 62 (2006) o3269–o3270; doi:10.1107/S1600536806025657

data_2209819
_publ_section_title
;
 8\a,9\a-Epoxy-7-oxoroyleanon
;
_journal_coeditor_code           CV2078
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3269
_journal_page_last               o3270
_journal_paper_doi               10.1107/S1600536806025657
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C20 H26 O5'
_chemical_formula_moiety         'C20 H26 O5'
_chemical_formula_sum            'C20 H26 O5'
_chemical_formula_weight         346.41
_chemical_name_systematic
;
8\a,9\a-Epoxy-7-oxoroyleanon
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_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                 101.61(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.336(2)
_cell_length_b                   7.4770(15)
_cell_length_c                   11.760(2)
_cell_measurement_reflns_used    5289
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.10
_cell_measurement_theta_min      2.40
_cell_volume                     890.2(3)
_computing_cell_refinement       'SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'DENZO (Otwinowski & Minor, 1997)'
_computing_data_reduction        SCALEPACK
_computing_molecular_graphics
'ORTEPII (Johnson, 1976) and PLATON (Spek, 2003)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.976
_diffrn_measurement_device_type  'MAC DIP 2030K'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0380
_diffrn_reflns_av_sigmaI/netI    0.0120
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5289
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         27.10
_diffrn_reflns_theta_min         2.40
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.292
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             372
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.249
_refine_diff_density_min         -0.183
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.086
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     227
_refine_ls_number_reflns         2066
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.086
_refine_ls_R_factor_all          0.0654
_refine_ls_R_factor_gt           0.0599
_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^)+(0.071P)^2^+0.3757P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1484
_refine_ls_wR_factor_ref         0.1524
_reflns_number_gt                1845
_reflns_number_total             2066
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            cv2078.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2209819
_cod_database_fobs_code          2209819