Cytotoxic triterpenoid alkaloids from Buxus microphylla.
Yan, Yu-Xin; Hu, Xiao-Dong; Chen, Jian-Chao; Sun, Yun; Zhang, Xian-Min; Qing, Chen; Qiu, Ming-Hua; Journal of natural products 72 (2009) 308–311; doi:10.1021/np800719h

data_1503685
_publ_section_title
;
 Cytotoxic triterpenoid alkaloids from Buxus microphylla.
;
_journal_issue                   2
_journal_name_full               'Journal of natural products'
_journal_page_first              308
_journal_page_last               311
_journal_paper_doi               10.1021/np800719h
_journal_volume                  72
_journal_year                    2009
_chemical_formula_sum            'C36 H54 N2 O6'
_chemical_formula_weight         610.81
_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                81.293(2)
_cell_angle_beta                 87.547(2)
_cell_angle_gamma                72.743(2)
_cell_formula_units_Z            1
_cell_length_a                   6.7780(12)
_cell_length_b                   7.8277(14)
_cell_length_c                   16.835(3)
_cell_measurement_reflns_used    7025
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      28.17
_cell_measurement_theta_min      2.45
_cell_volume                     843.2(3)
_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 0.894
_diffrn_measured_fraction_theta_max 0.894
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0600
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            7025
_diffrn_reflns_theta_full        28.17
_diffrn_reflns_theta_max         28.17
_diffrn_reflns_theta_min         2.45
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  0.9936
_exptl_absorpt_correction_T_min  0.9856
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.203
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             332
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.176
_refine_diff_density_min         -0.190
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.2(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     406
_refine_ls_number_reflns         7025
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0973
_refine_ls_R_factor_gt           0.0553
_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^)+(0.0561P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1158
_refine_ls_wR_factor_ref         0.1382
_reflns_number_gt                4296
_reflns_number_total             7025
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np800719h_si_001.cif
_cod_data_source_block           080402b
_cod_depositor_comments
;
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 2.4.2 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      P1
_cod_database_code               1503685