A pimpinellin monomer and dimer isolated from the roots of <i>Esenbeckia grandiflora</i>
Oliveira, P. E. S. de; Conserva, L.M.; De Simone, C.A.; Pereira, M.A.; Malta, V.R.S.; Imbroisi, D.O.; Acta Crystallographica Section C 60 (2004) o900–o902; doi:10.1107/S0108270104023777

data_2014553
_publ_section_title
;
 A pimpinellin monomer and dimer isolated from the roots of
 <i>Esenbeckia grandiflora</i>
;
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o900
_journal_page_last               o902
_journal_paper_doi               10.1107/S0108270104023777
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C26 H20 O10'
_chemical_formula_moiety         'C26 H20 O10'
_chemical_formula_sum            'C26 H20 O10'
_chemical_formula_weight         492.44
_chemical_name_systematic
;
5,5',6,6'-tetramethoxy-3,3',4,4'-tetrahydro-2H,2'H-3,3':4,4'-
bi(furo[2,3-h]-1-benzopyran)-2,2'-dione
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                84.000(10)
_cell_angle_beta                 83.280(10)
_cell_angle_gamma                77.660(10)
_cell_formula_units_Z            4
_cell_length_a                   9.205(2)
_cell_length_b                   14.285(4)
_cell_length_c                   17.978(5)
_cell_measurement_reflns_used    7179
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      0.998
_cell_volume                     2285.8(10)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius, 1997--2000)'
_computing_data_reduction
'HKL  Denzo (Otwinowski & Minor, 1997) and Scalepack'
_computing_molecular_graphics    'Ortep-3 (Farrugia, 1997)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       'CCD rotation images,thick slices'
_diffrn_radiation_monochromator  'horizonally mounted graphite crystal'
_diffrn_radiation_source         'Enraf Nonius FR590'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0499
_diffrn_reflns_av_sigmaI/netI    0.1198
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            15850
_diffrn_reflns_theta_full        27.55
_diffrn_reflns_theta_max         27.55
_diffrn_reflns_theta_min         2.28
_exptl_absorpt_coefficient_mu    0.111
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.431
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             1024
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.190
_refine_diff_density_min         -0.182
_refine_ls_extinction_coef       0.0033(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     650
_refine_ls_number_reflns         10375
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.1934
_refine_ls_R_factor_gt           0.0764
_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^)+(0.0545P)^2^+0.6753P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1394
_refine_ls_wR_factor_ref         0.1825
_reflns_number_gt                4472
_reflns_number_total             10555
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sq1167.cif
_cod_data_source_block           II
_cod_database_code               2014553
_cod_database_fobs_code          2014553