Cytotoxic alkaloids from the twigs and leaves of <i>Cephalotaxus sinensis</i>.
Zhang, Fuxin; Yang, Tao; Yang, Kailing; Zhou, Ruixi; Zhang, Yu; Chen, Wenwen; Liu, Zhetong; Zhan, Guanqun; Guo, Zengjun; Organic & biomolecular chemistry 21 (2022) 169–178; doi:10.1039/d2ob01980a

data_7159021
_publ_section_title
;
 Cytotoxic alkaloids from the twigs and leaves of <i>Cephalotaxus
 sinensis</i>.
;
_journal_issue                   1
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              169
_journal_page_last               178
_journal_paper_doi               10.1039/d2ob01980a
_journal_volume                  21
_journal_year                    2022
_chemical_absolute_configuration ad
_chemical_formula_sum            'C27 H39 N O11'
_chemical_formula_weight         553.59
_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   mixed
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2022-10-19 deposited with the CCDC.	2022-11-28 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90.836(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.4013(5)
_cell_length_b                   26.2244(16)
_cell_length_c                   12.2587(7)
_cell_measurement_reflns_used    9836
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      62.56
_cell_measurement_theta_min      3.14
_cell_volume                     3022.0(3)
_computing_cell_refinement       'Bruker SAINT V8.40B'
_computing_data_collection       'Bruker APEX3'
_computing_data_reduction        'Bruker SAINT V8.40B'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker D8 Ventrue'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           GaK\a
_diffrn_radiation_wavelength     1.34139
_diffrn_reflns_av_R_equivalents  0.0457
_diffrn_reflns_av_unetI/netI     0.0319
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            81736
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        53.594
_diffrn_reflns_theta_max         63.132
_diffrn_reflns_theta_min         3.137
_exptl_absorpt_coefficient_mu    0.503
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.217
_exptl_crystal_description       block
_exptl_crystal_F_000             1184
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.605
_refine_diff_density_min         -0.335
_refine_diff_density_rms         0.053
_refine_ls_abs_structure_details
;
 Flack x determined using 5651 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.02(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.098
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     739
_refine_ls_number_reflns         14799
_refine_ls_number_restraints     9
_refine_ls_restrained_S_all      1.100
_refine_ls_R_factor_all          0.0549
_refine_ls_R_factor_gt           0.0490
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1077P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1472
_refine_ls_wR_factor_ref         0.1512
_reflns_Friedel_coverage         0.950
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.988
_reflns_number_gt                13014
_reflns_number_total             14799
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2ob01980a2.cif
_cod_data_source_block           211211b_0m
_cod_depositor_comments
'Adding full bibliography for 7159015--7159021.cif.'
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7159021
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.906
_shelx_estimated_absorpt_t_max   0.951
_shelx_res_checksum              12121
_shelx_fab_checksum              28618