Synthesis and crystal structures of a 3-acetylated (20<i>S</i>,24<i>S</i>)-ocotillol-type saponin and its C-24 epimer
Liu, Juan; Xu, Yang-Rong; An, Xing-Si; Hou, Gui-Ge; Meng, Qing-Guo; Acta Crystallographica Section C 73 (2017) 464–469; doi:10.1107/S2053229617006507

data_2020816
_publ_section_title
;
 Synthesis and crystal structures of a 3-acetylated
 (20<i>S</i>,24<i>S</i>)-ocotillol-type saponin and its C-24 epimer
;
_journal_coeditor_code           LF3050
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              464
_journal_page_last               469
_journal_paper_doi               10.1107/S2053229617006507
_journal_volume                  73
_journal_year                    2017
_chemical_formula_iupac          'C32 H54 O5, 0.5C2 H6 O1'
_chemical_formula_moiety         'C32 H54 O5, 0.5(C2 H6 O1)'
_chemical_formula_sum            'C33 H57 O5.5'
_chemical_formula_weight         541.79
_chemical_name_systematic
;
(20<i>S</i>,24<i>R</i>)-3-Acetyl-20,24-epoxydammarane-3\b,12\b,25-triol ethanol
hemisolvate
;
_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           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 108.343(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.9895(11)
_cell_length_b                   8.2912(4)
_cell_length_c                   22.7981(18)
_cell_measurement_reflns_used    2108
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      51.2350
_cell_measurement_theta_min      5.9350
_cell_volume                     3227.7(4)
_computing_cell_refinement
;
FRAMBO (Bruker, 2004)
;
_computing_data_collection
;
FRAMBO (Bruker, 2004)
;
_computing_data_reduction
;
SAINT (Bruker, 2012)
;
_computing_molecular_graphics
;
DIAMOND (Brandenburg, 2012)
;
_computing_publication_material
;
publCIF (Westrip, 2010)
;
_computing_structure_refinement
;
SHELXL2014 (Sheldrick, 2015)
;
_computing_structure_solution
;
SHELXS97 (Sheldrick, 2008)
;
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker FRAMBO CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0358
_diffrn_reflns_av_sigmaI/netI    0.0519
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            11562
_diffrn_reflns_theta_full        66.04
_diffrn_reflns_theta_max         66.04
_diffrn_reflns_theta_min         3.77
_exptl_absorpt_coefficient_mu    0.579
_exptl_absorpt_correction_T_max  0.8639
_exptl_absorpt_correction_T_min  0.7684
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Sheldrick, 2003)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.115
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       bolck
_exptl_crystal_F_000             1196
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.301
_refine_diff_density_min         -0.183
_refine_ls_abs_structure_details
;
Flack (1983), <b>??? Friedel pairs</b>
;
_refine_ls_abs_structure_Flack   0.0(3)
_refine_ls_extinction_coef       0.0030(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method
;
(Sheldrick, 2015)
;
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     715
_refine_ls_number_reflns         7805
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0799
_refine_ls_R_factor_gt           0.0538
_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^)+(0.0694P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1301
_refine_ls_wR_factor_ref         0.1530
_reflns_number_gt                5421
_reflns_number_total             7805
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            lf3050sup1.cif
_cod_data_source_block           IIIb
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2020816
_cod_database_fobs_code          2020816