ent-Labdane Diterpenes from the Stems of Mallotus japonicus.
Li, De-Zheng; Tang, Chunping; Quinn, Ronald J.; Feng, Yunjiang; Ke, Chang-Qiang; Yao, Sheng; Ye, Yang; Journal of natural products 76 (2013) 1580–1585; doi:10.1021/np400241p

data_1512268
_publ_section_title
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 ent-Labdane Diterpenes from the Stems of Mallotus japonicus.
;
_journal_issue                   9
_journal_name_full               'Journal of natural products'
_journal_page_first              1580
_journal_page_last               1585
_journal_paper_doi               10.1021/np400241p
_journal_volume                  76
_journal_year                    2013
_chemical_absolute_configuration ad
_chemical_formula_sum            'C20 H32 O4'
_chemical_formula_weight         336.46
_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                   6.08540(10)
_cell_length_b                   13.6015(2)
_cell_length_c                   22.6317(3)
_cell_measurement_reflns_used    4785
_cell_measurement_temperature    140(2)
_cell_measurement_theta_max      68.85
_cell_measurement_theta_min      3.25
_cell_volume                     1873.24(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      140(2)
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0376
_diffrn_reflns_av_sigmaI/netI    0.0347
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            12882
_diffrn_reflns_theta_full        69.58
_diffrn_reflns_theta_max         69.58
_diffrn_reflns_theta_min         3.79
_exptl_absorpt_coefficient_mu    0.648
_exptl_absorpt_correction_T_max  0.9622
_exptl_absorpt_correction_T_min  0.8813
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.193
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.272
_refine_diff_density_min         -0.236
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.3(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     271
_refine_ls_number_reflns         3433
_refine_ls_number_restraints     12
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0471
_refine_ls_R_factor_gt           0.0448
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0876P)^2^+0.3275P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1299
_refine_ls_wR_factor_ref         0.1327
_reflns_number_gt                3244
_reflns_number_total             3433
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np400241p_si_002.cif
_cod_data_source_block           cu_dm13021_0m
_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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1512268