Structures, chemotaxonomic significance, cytotoxic and Na(+),K(+)-ATPase inhibitory activities of new cardenolides from Asclepias curassavica.
Zhang, Rong-Rong; Tian, Hai-Yan; Tan, Ya-Fang; Chung, Tse-Yu; Sun, Xiao-Hui; Xia, Xue; Ye, Wen-Cai; Middleton, David A.; Fedosova, Natalya; Esmann, Mikael; Tzen, Jason T. C.; Jiang, Ren-Wang; Organic & biomolecular chemistry 12 (2014) 8919–8929; doi:10.1039/c4ob01545b

data_7154093
_publ_section_title
;
 Structures, chemotaxonomic significance, cytotoxic and Na(+),K(+)-ATPase
 inhibitory activities of new cardenolides from Asclepias curassavica.
;
_journal_issue                   44
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              8919
_journal_page_last               8929
_journal_paper_doi               10.1039/c4ob01545b
_journal_volume                  12
_journal_year                    2014
_chemical_absolute_configuration rm
_chemical_formula_sum            'C26 H38 N O6'
_chemical_formula_weight         460.57
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4301(3)
_cell_length_b                   11.8072(3)
_cell_length_c                   18.7440(5)
_cell_measurement_reflns_used    4122
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      62.9260
_cell_measurement_theta_min      4.7200
_cell_volume                     2308.33(11)
_computing_cell_refinement       'CrysAlis PRO '
_computing_data_collection       'CrysAlis PRO '
_computing_data_reduction        'CrysAlis PRO'
_computing_molecular_graphics    'XP (Sheldrick, 2008)'
_computing_publication_material  'XP (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Agilent Gemini S ultra'
_diffrn_measurement_method       'omega scan'
_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  0.0219
_diffrn_reflns_av_sigmaI/netI    0.0248
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6737
_diffrn_reflns_theta_full        62.74
_diffrn_reflns_theta_max         62.74
_diffrn_reflns_theta_min         4.72
_exptl_absorpt_coefficient_mu    0.755
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.84908
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'not measured'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.325
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       columnar
_exptl_crystal_F_000             996
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.171
_refine_diff_density_min         -0.162
_refine_diff_density_rms         0.033
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.04(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         3514
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.065
_refine_ls_R_factor_all          0.0328
_refine_ls_R_factor_gt           0.0315
_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^)+(0.0433P)^2^+0.4457P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0798
_refine_ls_wR_factor_ref         0.0810
_reflns_number_gt                3400
_reflns_number_total             3514
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ob01545b2.cif
_cod_data_source_block           qr12
_cod_depositor_comments
'Adding full bibliography for 7154092--7154095.cif.'
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7154093