Vieillardiixanthone B
Boonnak, Nawong; Chantrapromma, Suchada; Fun, Hoong-Kun; Karalai, Chatchanok; Acta Crystallographica Section E 66 (2010) o817–o818; doi:10.1107/S1600536810007026

data_2225703
_publ_section_title
;
 Vieillardiixanthone B
;
_journal_coeditor_code           SJ2732
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o817
_journal_page_last               o818
_journal_paper_doi               10.1107/S1600536810007026
_journal_volume                  66
_journal_year                    2010
_chemical_formula_iupac          'C20 H20 O6'
_chemical_formula_moiety         'C20 H20 O6'
_chemical_formula_sum            'C20 H20 O6'
_chemical_formula_weight         356.36
_chemical_melting_point_gt       486
_chemical_melting_point_lt       488
_chemical_name_common
;
Vieillardiixanthone B
;
_chemical_name_systematic
;
1,5-dihydroxy-3,6-dimethoxy-4-(2-methylbut-3-en-2-yl)-9<i>H</i>-xanthen-9-one
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 90.208(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.1500(4)
_cell_length_b                   14.7396(4)
_cell_length_c                   9.5177(3)
_cell_measurement_reflns_used    3906
_cell_measurement_temperature    100
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      2.17
_cell_volume                     1704.48(9)
_computing_cell_refinement       'SAINT (Bruker, 2005)'
_computing_data_collection       'APEX2 (Bruker, 2005)'
_computing_data_reduction        'SAINT (Bruker, 2005)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material
;
SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009)
;
_computing_structure_refinement  'SHELXTL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEXII CCD area-detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0708
_diffrn_reflns_av_sigmaI/netI    0.0431
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            37868
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.17
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_T_max  0.9778
_exptl_absorpt_correction_T_min  0.9506
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2005)'
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.389
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             752
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.272
_refine_diff_density_min         -0.266
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         3906
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0895
_refine_ls_R_factor_gt           0.0537
_refine_ls_shift/su_max_lt       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^)+(0.0609P)^2^+0.5536P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1165
_refine_ls_wR_factor_ref         0.1330
_reflns_number_gt                2682
_reflns_number_total             3906
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sj2732.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2225703
_cod_database_fobs_code          2225703