The natural diterpenoid kamebanin
Pan, Yuan Jiang; Shi, Hao; Acta Crystallographica Section C 58 (2002) o323–o324; doi:10.1107/S0108270102007175

data_2012757
_publ_section_title
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 The natural diterpenoid kamebanin
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_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o323
_journal_page_last               o324
_journal_paper_doi               10.1107/S0108270102007175
_journal_volume                  58
_journal_year                    2002
_chemical_formula_iupac          'C20 H30 O4'
_chemical_formula_moiety         'C20 H30 O4'
_chemical_formula_sum            'C20 H30 O4'
_chemical_formula_weight         334.44
_chemical_melting_point          .539E-305
_chemical_name_common            Kamebanin
_chemical_name_systematic
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rel-(-)-(1R,4R,8S,9R,10S,13S,16R)-2,8,16-trihydroxy-5,5,9-trimethyl-14-
methylenetetracyclo[11.2.1.0^1,10^.0^4,9^]hexadecan-15-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           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                   6.5680(10)
_cell_length_b                   13.282(3)
_cell_length_c                   20.801(5)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    289(2)
_cell_measurement_theta_max      12.92
_cell_measurement_theta_min      3.06
_cell_volume                     1814.6(7)
_computing_cell_refinement       XSCANS
_computing_data_collection       'XSCANS (Siemens, 1994)'
_computing_data_reduction        XSCANS
_computing_molecular_graphics    'PLATON (Spek, 2002)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      289(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0164
_diffrn_reflns_av_sigmaI/netI    0.0525
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            2363
_diffrn_reflns_theta_full        26.50
_diffrn_reflns_theta_max         26.50
_diffrn_reflns_theta_min         1.82
_diffrn_standards_decay_%        0.44
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.224
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.66
_exptl_crystal_size_mid          0.54
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.155
_refine_diff_density_min         -0.156
_refine_ls_extinction_coef       0.0071(11)
_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   0.927
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     224
_refine_ls_number_reflns         2176
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.927
_refine_ls_R_factor_all          0.0736
_refine_ls_R_factor_gt           0.0447
_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^)+(0.0514P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0945
_refine_ls_wR_factor_ref         0.1048
_reflns_number_gt                1446
_reflns_number_total             2176
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            gd1200.cif
_cod_data_source_block           I
_cod_depositor_comments
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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 
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_cod_database_code               2012757
_cod_database_fobs_code          2012757