Two polycyclic compounds derived from a Diels–Alder reaction
Zukerman-Schpector, J.; Caracelli, I.; Vega, Mauricio; Constantino, Mauricio Gomes; Beatriz, Adilson; da Silva, Gil Valdo; Acta Crystallographica Section C 57 (2001) 646–648; doi:10.1107/S0108270101003365

data_2011958
_publ_section_title
;
 Two polycyclic compounds derived from a Diels--Alder reaction
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              646
_journal_page_last               648
_journal_paper_doi               10.1107/S0108270101003365
_journal_volume                  57
_journal_year                    2001
_chemical_formula_moiety         'C12 H16 O5'
_chemical_formula_sum            'C12 H16 O5'
_chemical_formula_weight         240.25
_chemical_name_systematic
;
9,10-dimethoxy-11-oxatricyclo[6.2.1.0^2,7^]undeca-4,9-diene-3,6-diol
;
_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'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.0796(4)
_cell_length_b                   10.1970(7)
_cell_length_c                   13.7534(9)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293
_cell_measurement_theta_max      18.42
_cell_measurement_theta_min      9.98
_cell_volume                     1133.11(12)
_computing_cell_refinement       'CAD-4 Software'
_computing_data_collection       'CAD-4 Software (Enraf-Nonius,1989)'
_computing_data_reduction        'XCAD-4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'ZORTEP (Zsolnai, 1995)'
_computing_publication_material
'PARST95 (Nardelli, 1995), PLATON (Spek, 1998) and WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1985)'
_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     .71073
_diffrn_reflns_limit_h_max       0
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1235
_diffrn_reflns_theta_max         25.45
_diffrn_standards_decay_%        1.0
_diffrn_standards_interval_time  30
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    .110
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.408
_exptl_crystal_density_meas      ?
_exptl_crystal_description       irregular
_exptl_crystal_F_000             512
_exptl_crystal_size_max          .20
_exptl_crystal_size_mid          .10
_exptl_crystal_size_min          .05
_refine_diff_density_max         .13
_refine_diff_density_min         -.12
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.054
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     156
_refine_ls_number_reflns         1235
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_restrained_S_obs      1.054
_refine_ls_R_factor_all          .034
_refine_ls_R_factor_gt           .028
_refine_ls_shift/su_max          <0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0386P)^2^+0.2105P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         .073
_refine_ls_wR_factor_ref         .071
_reflns_number_gt                1131
_reflns_number_total             1235
_reflns_threshold_expression     F^2^>2\sF^2^
_cod_data_source_file            da1175.cif
_cod_data_source_block           I
_cod_depositor_comments
;
Automatic conversion scripts had previously changed 
'_atom_site_refinement_flags' tag values 'd' into 'D' as recommended by 
'cif_core.dic' version 2.4.1. However, manual inspection revealed that the 
underlying problem was actually related to a wrong tag names inside the 
atom site loop. The following changes were performed to resolve the problem: 

* '_atom_site_refinement_flags' tag was changed to '_atom_site_calc_flag'
* '_atom_site_calc_flag' tag was changed to '_atom_site_site_symmetry_order'
* '_atom_site_disorder_group' tag was changed to 
  '_atom_site_refinement_flags_posn'

Antanas Vaitkus,
2015-02-19

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_database_code               2011958
_cod_database_fobs_code          2011958