Swerilactones A and B, anti-HBV new lactones from a tradtional Chinese herb: Swertia mileensis as a treatment for viral hepatitis.
Geng, Chang-An; Jiang, Zhi-Yong; Ma, Yun-Bao; Luo, Jie; Zhang, Xue-Mei; Wang, Hong-Ling; Shen, Yong; Zuo, Ai-Xue; Zhou, Jun; Chen, Ji-Jun; Organic letters 11 (2009) 4120–4123; doi:10.1021/ol901592f

data_1504125
_publ_section_title
;
 Swerilactones A and B, anti-HBV new lactones from a tradtional Chinese
 herb: Swertia mileensis as a treatment for viral hepatitis.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              4120
_journal_page_last               4123
_journal_paper_doi               10.1021/ol901592f
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C18 H21 O6'
_chemical_formula_weight         333.35
_chemical_name_systematic
;

 ?

;
_space_group_IT_number           7
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P -2yc'
_symmetry_space_group_name_H-M   'P 1 c 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                 111.745(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.4578(12)
_cell_length_b                   15.834(3)
_cell_length_c                   7.0431(12)
_cell_measurement_reflns_used    1238
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      23.13
_cell_measurement_theta_min      2.57
_cell_volume                     772.5(2)
_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 0.982
_diffrn_measured_fraction_theta_max 0.952
_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  0.0274
_diffrn_reflns_av_sigmaI/netI    0.0526
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            4909
_diffrn_reflns_theta_full        28.33
_diffrn_reflns_theta_max         28.33
_diffrn_reflns_theta_min         2.57
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_T_max  0.9936
_exptl_absorpt_correction_T_min  0.9851
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.433
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             354
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.159
_refine_diff_density_min         -0.352
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.7(15)
_refine_ls_extinction_coef       0.020(6)
_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   0.890
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     221
_refine_ls_number_reflns         3116
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.890
_refine_ls_R_factor_all          0.0771
_refine_ls_R_factor_gt           0.0498
_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^)+(0.1000P)^2^+0.0800P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1312
_refine_ls_wR_factor_ref         0.1550
_reflns_number_gt                2181
_reflns_number_total             3116
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901592f_si_003.cif
_cod_data_source_block           090622c
_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      Pc
_cod_database_code               1504125