Crystal structure of pseudoguainolide
Beghidja, Noureddine; Benayache, Samir; Benayache, Fadila; Knight, David W.; Kariuki, Benson M.; Acta Crystallographica Section E Crystallographic Communications 71 (2015) o162–; doi:10.1107/S2056989015002510

data_2019858
_publ_section_title
;
 Crystal structure of pseudoguainolide
;
_journal_issue                   3
_journal_name_full
'Acta Crystallographica Section E Crystallographic Communications'
_journal_page_first              o162
_journal_paper_doi               10.1107/S2056989015002510
_journal_volume                  71
_journal_year                    2015
_chemical_formula_iupac          'C15 H22 O3'
_chemical_formula_moiety         'C15 H22 O3'
_chemical_formula_sum            'C15 H22 O3'
_chemical_formula_weight         250.33
_chemical_name_systematic
;
3,4a,8-Trimethyldodecahydroazuleno[6,5-<i>b</i>]furan-2,5-dione
;
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_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                   7.4320(3)
_cell_length_b                   11.9278(3)
_cell_length_c                   15.3152(6)
_cell_measurement_reflns_used    3098
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      3.05
_cell_volume                     1357.65(8)
_computing_cell_refinement
;
SCALEPACK (Otwinowski & Minor, 1997)
;
_computing_data_collection
;
COLLECT (Nonius, 2000)
;
_computing_data_reduction
;
DENZO and SCALEPACK (Otwinowski & Minor, 1997)
;
_computing_molecular_graphics
;
ORTEP-3 for Windows (Farrugia, 2012)
;
_computing_publication_material
;
WinGX (Farrugia, 2012)
;
_computing_structure_refinement
;
SHELXL97 (Sheldrick, 2008)
;
_computing_structure_solution
;
SIR92 (Altomare <i>et al.</i>,  1999)
;
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       'CCD slices, \w and \f scans'
_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  0.0410
_diffrn_reflns_av_sigmaI/netI    0.0403
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            9382
_diffrn_reflns_theta_full        27.45
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         3.05
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.9967
_exptl_absorpt_correction_T_min  0.9835
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(DENZO/SCALEPACK; Otwinowski & Minor, 1997)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.225
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.152
_refine_diff_density_min         -0.162
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.077
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     166
_refine_ls_number_reflns         3098
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.077
_refine_ls_R_factor_all          0.0637
_refine_ls_R_factor_gt           0.0474
_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^)+(0.0453P)^2^+0.2031P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0990
_refine_ls_wR_factor_ref         0.1070
_reflns_number_gt                2533
_reflns_number_total             3098
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            tk5358sup1.cif
_cod_data_source_block           I
_cod_database_code               2019858
_cod_database_fobs_code          2019858