Cytotoxic Bufadienolides from the Leaves of <i>Melianthus major</i>.
Bedane, Kibrom Gebreheiwot; Brieger, Lukas; Strohmann, Carsten; Seo, Ean-Jeong; Efferth, Thomas; Spiteller, Michael; Journal of natural products 83 (2020) 2122–2128; doi:10.1021/acs.jnatprod.0c00060

data_1558589
_publ_section_title
;
 Cytotoxic Bufadienolides from the Leaves of <i>Melianthus major</i>.
;
_journal_issue                   7
_journal_name_full               'Journal of natural products'
_journal_page_first              2122
_journal_page_last               2128
_journal_paper_doi               10.1021/acs.jnatprod.0c00060
_journal_volume                  83
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C26 H30 O7'
_chemical_formula_sum            'C26 H30 O7'
_chemical_formula_weight         454.50
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2019-05-13
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_cell_angle_alpha                90
_cell_angle_beta                 110.004(2)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.1460(8)
_cell_length_b                   10.4082(9)
_cell_length_c                   10.8554(9)
_cell_measurement_reflns_used    9909
_cell_measurement_temperature    100
_cell_measurement_theta_max      80.19
_cell_measurement_theta_min      4.33
_cell_volume                     1077.19(16)
_computing_cell_refinement       'SAINT V8.38A (?, 2016)'
_computing_data_reduction        'SAINT V8.38A (?, 2016)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'XT (Sheldrick, 2015)'
_diffrn_ambient_temperature      99.91
_diffrn_detector                 'Bruker D8 VENTURE area detector'
_diffrn_detector_area_resol_mean 10.4167
_diffrn_detector_type            'CPAD PHOTON II area detector'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'Bruker D8 VENTURE area detector'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  'HELIOS mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0324
_diffrn_reflns_av_unetI/netI     0.0179
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.987
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            35024
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.965
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         80.174
_diffrn_reflns_theta_min         4.334
_diffrn_source                   'microfocus sealed X-ray tube'
_diffrn_source_type              'Incoatec I\ms'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.833
_exptl_absorpt_correction_T_max  0.7543
_exptl_absorpt_correction_T_min  0.6749
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1532 before and 0.0559 after correction. The Ratio of minimum to maximum transmission is 0.8947. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.401
_exptl_crystal_description       prism
_exptl_crystal_F_000             484
_exptl_crystal_size_max          0.284
_exptl_crystal_size_mid          0.228
_exptl_crystal_size_min          0.079
_refine_diff_density_max         0.260
_refine_diff_density_min         -0.203
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details
;
 Flack x determined using 2068 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.02(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     300
_refine_ls_number_reflns         4552
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0293
_refine_ls_R_factor_gt           0.0292
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0484P)^2^+0.2376P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0794
_refine_ls_wR_factor_ref         0.0795
_reflns_Friedel_coverage         0.853
_reflns_Friedel_fraction_full    0.997
_reflns_Friedel_fraction_max     0.940
_reflns_number_gt                4533
_reflns_number_total             4552
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np0c00060_si_003.cif
_cod_data_source_block           c0100_0m
_cod_depositor_comments
'Adding full bibliography for 1558588--1558589.cif.'
_cod_database_code               1558589
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.937
_shelx_estimated_absorpt_t_min   0.798
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C6(H6), C7(H7), C8(H8), C9(H9), C14(H14), C15(H15), C21(H21), C23(H23)
2.b Secondary CH2 refined with riding coordinates:
 C12(H12A,H12B), C13(H13A,H13B), C16(H16A,H16B), C17(H17A,H17B), C22(H22A,
 H22B), C24(H24A,H24B)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C5(H5), C20(H20)
2.d Idealised Me refined as rotating group:
 C11(H11A,H11B,H11C), C26(H26A,H26B,H26C)
;
_shelx_res_checksum              13860
_shelx_hkl_checksum              30740
_olex2_submission_special_instructions 'No special instructions were received'