1-Hydroxy-2,3,4,7-tetramethoxyxanthone from<i>Swertia Chirayita</i>
Gao-Feng Shi; Run-Hua Lu; Yun-Shang Yang; Chun-lei Li; Ai-Mei Yang; Li-Xiang Cai; Acta Crystallographica Section E 60 (2004) o878–o880; doi:10.1107/S1600536804009171

data_2203657
_publ_section_title
;
 1-Hydroxy-2,3,4,7-tetramethoxyxanthone from<i>Swertia Chirayita</i>
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o878
_journal_page_last               o880
_journal_paper_doi               10.1107/S1600536804009171
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C17 H16 O7'
_chemical_formula_moiety         'C17 H16 O7'
_chemical_formula_sum            'C17 H16 O7'
_chemical_formula_weight         332.30
_chemical_name_common            1-hydroxy-2,3,4,7-tetramethoxyxanthone
_chemical_name_systematic
;
1-hydroxy-2,3,4,7-tetramethoxy-9H-xanthen-9-one
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 95.18(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.1510(10)
_cell_length_b                   13.229(3)
_cell_length_c                   16.044(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      20
_cell_measurement_theta_min      10
_cell_volume                     1511.6(5)
_computing_cell_refinement       'CAD-4 SDP/VAX'
_computing_data_collection       'CAD-4 SDP/VAX(Enraf-Nonius, 1989)'
_computing_data_reduction        'MolEN/PC (Fair, 1990)'
_computing_molecular_graphics    'SHELXTL/PC (Siemens, 1994)'
_computing_publication_material  SHELXTL/PC
_computing_structure_refinement  'SHELXL-7 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_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  0.0627
_diffrn_reflns_av_sigmaI/netI    0.1329
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            2885
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        0.2
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.460
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.218
_refine_diff_density_min         -0.281
_refine_ls_extinction_coef       0.0024(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.978
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         2661
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.978
_refine_ls_R_factor_all          0.2285
_refine_ls_R_factor_gt           0.0520
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0547P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1161
_refine_ls_wR_factor_ref         0.1652
_reflns_number_gt                923
_reflns_number_total             2661
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            su6088.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 

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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2203657
_cod_database_fobs_code          2203657