Structure revision and synthesis of a novel labdane diterpenoid from Zingiber ottensii.
Boukouvalas, John; Wang, Jian-Xin; Organic letters 10 (2008) 3397–3399; doi:10.1021/ol8011919

data_1504791
_publ_section_title
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 Structure revision and synthesis of a novel labdane diterpenoid from
 Zingiber ottensii.
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_journal_issue                   16
_journal_name_full               'Organic letters'
_journal_page_first              3397
_journal_page_last               3399
_journal_paper_doi               10.1021/ol8011919
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C20 H28 O2'
_chemical_formula_sum            'C20 H28 O2'
_chemical_formula_weight         300.42
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                91.2787(10)
_cell_angle_beta                 97.7238(11)
_cell_angle_gamma                114.4076(10)
_cell_formula_units_Z            2
_cell_length_a                   6.3335(6)
_cell_length_b                   7.2872(7)
_cell_length_c                   20.5729(18)
_cell_measurement_reflns_used    2975
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      25.86
_cell_measurement_theta_min      3.01
_cell_volume                     853.61(14)
_computing_cell_refinement       'APEX 2 (Bruker, 2005b)'
_computing_data_collection       'APEX 2 (Bruker, 2005b)'
_computing_data_reduction        'SAINT (Bruker, 2003)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2001)'
_computing_publication_material  'SHELXTL (Bruker, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker Smart APEX II 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  0.0250
_diffrn_reflns_av_sigmaI/netI    0.0297
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            9327
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9927
_exptl_absorpt_correction_T_min  0.9825
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2004)'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.169
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             328
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.142
_refine_diff_density_min         -0.144
_refine_diff_density_rms         0.027
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     403
_refine_ls_number_reflns         3334
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0448
_refine_ls_R_factor_gt           0.0348
_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^)+(0.0347P)^2^+0.1012P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0748
_refine_ls_wR_factor_ref         0.0798
_reflns_number_gt                2847
_reflns_number_total             3334
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol8011919-file001.cif
_cod_data_source_block           jbk001
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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_original_sg_symbol_H-M      P1
_cod_database_code               1504791