1,6,6-Trimethyl-1,2,6,7,8,9-hexahydrophenanthro[1,2-<i>b</i>]furan-10,11-dione
Zhang, Lei; Wang, Jingkang; Qu, Yi; Acta Crystallographica Section E 61 (2005) o3127–o3128; doi:10.1107/S1600536805027303

data_2206903
_publ_section_title
1,6,6-Trimethyl-1,2,6,7,8,9-hexahydrophenanthro[1,2-<i>b</i>]furan-10,11-dione
_journal_coeditor_code           CI6603
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3127
_journal_page_last               o3128
_journal_paper_doi               10.1107/S1600536805027303
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C19 H20 O3'
_chemical_formula_moiety         'C19 H20 O3'
_chemical_formula_sum            'C19 H20 O3'
_chemical_formula_weight         296.35
_chemical_melting_point          460.2
_chemical_name_common            cryptotanshinone
_chemical_name_systematic
;
1,6,6-Trimethyl-1,2,6,7,8,9-hexahydrophenanthro[1,2-b]furan-10,11-dione
;
_space_group_IT_number           18
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2 2ab'
_symmetry_space_group_name_H-M   'P 21 21 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.458(3)
_cell_length_b                   21.356(4)
_cell_length_c                   9.874(2)
_cell_measurement_reflns_used    29524
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      3.14
_cell_volume                     3048.7(11)
_computing_cell_refinement       RAPID-AUTO
_computing_data_collection       'RAPID-AUTO (Rigaku, 2004)'
_computing_data_reduction        RAPID-AUTO)
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Rigaku R-axis rapid IP area-detector'
_diffrn_measurement_method       oscillation
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0497
_diffrn_reflns_av_sigmaI/netI    0.0349
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            29524
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.14
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.9946
_exptl_absorpt_correction_T_min  0.9445
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   '(ABSCOR; Higashi, 1995)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.291
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             1264
_exptl_crystal_size_max          0.67
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.166
_refine_diff_density_min         -0.173
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.906
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     416
_refine_ls_number_reflns         3906
_refine_ls_number_restraints     45
_refine_ls_restrained_S_all      0.941
_refine_ls_R_factor_all          0.0761
_refine_ls_R_factor_gt           0.0466
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         <0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0861P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1200
_refine_ls_wR_factor_ref         0.1315
_reflns_number_gt                2348
_reflns_number_total             3906
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ci6603.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_database_code               2206903