Vladimuliecins A and B: cytotoxic pentacyclic pregnanols from Vladimiria muliensis.
Chen, Jian-Jun; Li, Zheng-Ming; Gao, Kun; Chang, Jin; Yao, Xiao-Jun; Journal of natural products 72 (2009) 1128–1132; doi:10.1021/np900120q

data_1503691
_publ_section_title
;
 Vladimuliecins A and B: cytotoxic pentacyclic pregnanols from Vladimiria
 muliensis.
;
_journal_issue                   6
_journal_name_full               'Journal of natural products'
_journal_page_first              1128
_journal_page_last               1132
_journal_paper_doi               10.1021/np900120q
_journal_volume                  72
_journal_year                    2009
_chemical_formula_sum            'C21 H34 O4'
_chemical_formula_weight         350.48
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 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                 107.171(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.854(10)
_cell_length_b                   7.164(4)
_cell_length_c                   16.135(8)
_cell_measurement_reflns_used    3114
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      0.00
_cell_measurement_theta_min      0.00
_cell_volume                     1971.8(18)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0120
_diffrn_reflns_av_sigmaI/netI    0.0208
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5159
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.36
_exptl_absorpt_coefficient_mu    0.080
_exptl_absorpt_correction_T_max  0.981
_exptl_absorpt_correction_T_min  0.978
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.181
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             768
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.148
_refine_diff_density_min         -0.130
_refine_diff_density_rms         0.027
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   1.0(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.783
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     233
_refine_ls_number_reflns         3385
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.783
_refine_ls_R_factor_all          0.0388
_refine_ls_R_factor_gt           0.0352
_refine_ls_shift/su_max          0.001
_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^+0.5094P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1029
_refine_ls_wR_factor_ref         0.1092
_reflns_number_gt                3128
_reflns_number_total             3385
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np900120q_si_002.cif
_cod_data_source_block           c2
_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_cell_volume        1971.8(17)
_cod_original_sg_symbol_H-M      C2
_cod_database_code               1503691