Swerilactones C and D, anti-HBV new lactones from a traditional Chinese herb: Swertia mileensis.
Geng, Chang-An; Zhang, Xue-Mei; Shen, Yong; Zuo, Ai-Xue; Liu, Ji-Feng; Ma, Yun-Bao; Luo, Jie; Zhou, Jun; Jiang, Zhi-yong; Chen, Ji-Jun; Organic letters 11 (2009) 4838–4841; doi:10.1021/ol901881w

data_1504180
_publ_section_title
;
 Swerilactones C and D, anti-HBV new lactones from a traditional Chinese
 herb: Swertia mileensis.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              4838
_journal_page_last               4841
_journal_paper_doi               10.1021/ol901881w
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C20 H20 O8'
_chemical_formula_weight         388.36
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 103.542(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.547(2)
_cell_length_b                   10.892(3)
_cell_length_c                   12.418(4)
_cell_measurement_reflns_used    432
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      17.72
_cell_measurement_theta_min      2.52
_cell_volume                     860.9(5)
_computing_cell_refinement       'Bruker apex II'
_computing_data_collection       'Bruker apex II'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.984
_diffrn_measured_fraction_theta_max 0.954
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0572
_diffrn_reflns_av_sigmaI/netI    0.1676
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5620
_diffrn_reflns_theta_full        28.22
_diffrn_reflns_theta_max         28.22
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    0.117
_exptl_absorpt_correction_T_max  0.9907
_exptl_absorpt_correction_T_min  0.9816
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            coloulress
_exptl_crystal_density_diffrn    1.498
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             408
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.228
_refine_diff_density_min         -0.287
_refine_diff_density_rms         0.065
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(3)
_refine_ls_extinction_coef       0.048(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.900
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     256
_refine_ls_number_reflns         3852
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.900
_refine_ls_R_factor_all          0.1794
_refine_ls_R_factor_gt           0.0681
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.1200P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1487
_refine_ls_wR_factor_ref         0.2244
_reflns_number_gt                1635
_reflns_number_total             3852
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901881w_si_002.cif
_cod_data_source_block           090624d
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               1504180