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_7154092
_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 O6'
_chemical_formula_weight         446.56
_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                   11.4718(5)
_cell_length_b                   12.9514(5)
_cell_length_c                   15.8446(8)
_cell_measurement_reflns_used    2661
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      62.7030
_cell_measurement_theta_min      4.3870
_cell_volume                     2354.13(18)
_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  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Agilent Gemimi S ultra sappharie CCD'
_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  0.0338
_diffrn_reflns_av_sigmaI/netI    0.0404
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            6788
_diffrn_reflns_theta_full        62.76
_diffrn_reflns_theta_max         62.76
_diffrn_reflns_theta_min         4.41
_exptl_absorpt_coefficient_mu    0.711
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.93096
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2004)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.260
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       columnar
_exptl_crystal_F_000             968
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.134
_refine_diff_density_min         -0.169
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.13(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.062
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         3588
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.062
_refine_ls_R_factor_all          0.0408
_refine_ls_R_factor_gt           0.0353
_refine_ls_shift/su_max          0.013
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0451P)^2^+0.0347P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0824
_refine_ls_wR_factor_ref         0.0873
_reflns_number_gt                3276
_reflns_number_total             3588
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ob01545b2.cif
_cod_data_source_block           qr11
_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               7154092