Dehydrobrachylaenolide: an eudesmane-type sesquiterpene lactone
Rademeyer, M.; van Heerden, F. R.; van der Merwe, M. M.; Acta Crystallographica Section E 65 (2009) o196–; doi:10.1107/S1600536808042402

data_2220416
_publ_section_title
;
 Dehydrobrachylaenolide: an eudesmane-type sesquiterpene lactone
;
_journal_coeditor_code           BI2330
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o196
_journal_paper_doi               10.1107/S1600536808042402
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C15 H16 O3'
_chemical_formula_moiety         'C15 H16 O3'
_chemical_formula_sum            'C15 H16 O3'
_chemical_formula_weight         244.28
_chemical_name_systematic
;
Dehydrobrachylaenolide
;
_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'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.5648(6)
_cell_length_b                   11.1631(6)
_cell_length_c                   11.5542(6)
_cell_measurement_reflns_used    8167
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      31.8019
_cell_measurement_theta_min      3.9618
_cell_volume                     1233.67(12)
_computing_cell_refinement       'CrysAlis RED (Oxford Diffraction, 2006)'
_computing_data_collection       'CrysAlis CCD (Oxford Diffraction, 2006)'
_computing_data_reduction        'CrysAlis RED (Oxford Diffraction, 2006)'
_computing_molecular_graphics    'Mercury (Macrae <i>et al.</i>,  2006)'
_computing_publication_material
'PLATON (Spek, 2003) and WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.955
_diffrn_measurement_device_type  'Oxford Diffraction Excalibur2 CCD'
_diffrn_measurement_method       \w
_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  0.0160
_diffrn_reflns_av_sigmaI/netI    0.0156
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            12604
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         31.87
_diffrn_reflns_theta_min         3.97
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  0.963
_exptl_absorpt_correction_T_min  0.909
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(Blessing, 1995)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.315
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.307
_refine_diff_density_min         -0.206
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     163
_refine_ls_number_reflns         2294
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0397
_refine_ls_R_factor_gt           0.0328
_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^)+(0.0708P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0916
_refine_ls_wR_factor_ref         0.0950
_reflns_number_gt                1988
_reflns_number_total             2294
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bi2330.cif
_cod_data_source_block           I
_cod_database_code               2220416
_cod_database_fobs_code          2220416