(4<i>R</i>,5<i>R</i>,6<i>S</i>,7<i>R</i>,8<i>S</i>,9<i>R</i>,10<i>S</i>,13<i>S</i>)-7,8β-Epoxymomilactone-A
Shabnam Habib, Rana; Jamshaid, Muhammad; Tahir, M. Nawaz; Khan, Tahir Javed; Khan, Islam Ullah; Acta Crystallographica Section E 64 (2008) o892–; doi:10.1107/S1600536808010556

data_2218165
_publ_section_title
(4<i>R</i>,5<i>R</i>,6<i>S</i>,7<i>R</i>,8<i>S</i>,9<i>R</i>,10<i>S</i>,13<i>S</i>)-7,8\b-Epoxymomilactone-A
_journal_coeditor_code           IM2057
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o892
_journal_paper_doi               10.1107/S1600536808010556
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C20 H26 O4'
_chemical_formula_moiety         'C20 H26 O4'
_chemical_formula_sum            'C20 H26 O4'
_chemical_formula_weight         330.41
_chemical_name_systematic
;
(4<i>R</i>,5<i>R</i>,6<i>S</i>,7<i>R</i>,8<i>S</i>,9<i>R</i>,10<i>S</i>,\
13<i>S</i>)-7,8\b-Epoxymomilactone-A
;
_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           SHELXL97
_cell_angle_alpha                90.000
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.3996(7)
_cell_length_b                   13.1759(3)
_cell_length_c                   20.8540(10)
_cell_measurement_reflns_used    1295
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      28.63
_cell_measurement_theta_min      1.59
_cell_volume                     1758.4(2)
_computing_cell_refinement       'APEX2 (Bruker, 2007)'
_computing_data_collection       'APEX2 (Bruker, 2007)'
_computing_data_reduction        'SAINT (Bruker, 2007)'
_computing_molecular_graphics
'ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2003)'
_computing_publication_material
;
WinGX (Farrugia, 1999) and PLATON (Spek, 2003)
;
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_detector_area_resol_mean 7.30
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker Kappa APEX2 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  0.0750
_diffrn_reflns_av_sigmaI/netI    0.0695
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            19288
_diffrn_reflns_theta_full        28.85
_diffrn_reflns_theta_max         28.85
_diffrn_reflns_theta_min         2.49
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.990
_exptl_absorpt_correction_T_min  0.980
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2005)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.137
_refine_diff_density_min         -0.175
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     223
_refine_ls_number_reflns         2635
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.1418
_refine_ls_R_factor_gt           0.0496
_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^)+(0.0443P)^2^+0.0772P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0923
_refine_ls_wR_factor_ref         0.1168
_reflns_number_gt                1202
_reflns_number_total             2635
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            im2057.cif
_cod_data_source_block           I
_cod_database_code               2218165
_cod_database_fobs_code          2218165