The natural diterpenoid kamebacetal A
Shi, Hao; Sun, Cui Rong; Pan, Yuan Jiang; Acta Crystallographica Section E 60 (2004) o500–o502; doi:10.1107/S1600536804004416

data_2203520
_publ_section_title
;
 The natural diterpenoid kamebacetal A
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o500
_journal_page_last               o502
_journal_paper_doi               10.1107/S1600536804004416
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C21 H30 O5'
_chemical_formula_moiety         'C21 H30 O5'
_chemical_formula_sum            'C21 H30 O5'
_chemical_formula_weight         362.45
_chemical_name_common            'Kamebacetal A'
_chemical_name_systematic
;
(1S,2S,8S,9R,11R,15S,16S,18R)-15,18-dihydroxy-16-methoxy-12,12-dimethyl-
6-methylene-17-oxapentacyclo[7.6.2.1^5,8^.0^1,11^.0^2,8^]octadecan-7-one
;
_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                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8040(10)
_cell_length_b                   12.078(2)
_cell_length_c                   19.007(3)
_cell_measurement_reflns_used    38
_cell_measurement_temperature    289(2)
_cell_measurement_theta_max      15.01
_cell_measurement_theta_min      2.83
_cell_volume                     1791.5(5)
_computing_cell_refinement       XSCANS
_computing_data_collection       'XSCANS (Siemens, 1994)'
_computing_data_reduction        'SHELXTL (Siemens, 1991)'
_computing_molecular_graphics    'XP in SHELXTL'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      289(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-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    0.0710
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            2425
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        1.25
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.344
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       plate
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.42
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.174
_refine_diff_density_min         -0.156
_refine_ls_abs_structure_details none
_refine_ls_extinction_coef       0.0096(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 1997)'
_refine_ls_goodness_of_fit_ref   0.883
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     241
_refine_ls_number_reflns         2354
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.883
_refine_ls_R_factor_all          0.0850
_refine_ls_R_factor_gt           0.0426
_refine_ls_shift/su_max          0.025
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0369P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0783
_refine_ls_wR_factor_ref         0.0893
_reflns_number_gt                1396
_reflns_number_total             2354
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ww6140.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_database_code               2203520
_cod_database_fobs_code          2203520