Iboga-Type Alkaloids from Ervatamia officinalis.
Tang, Ben-Qin; Wang, Wen-Jing; Huang, Xiao-Jun; Li, Guo-Qiang; Wang, Lei; Jiang, Ren-Wang; Yang, Ting-Ting; Shi, Lei; Zhang, Xiao-Qi; Ye, Wen-Cai; Journal of natural products 77 (2014) 1839–; doi:10.1021/np500240b

data_1517381
_publ_section_title
;
 Iboga-Type Alkaloids from Ervatamia officinalis.
;
_journal_issue                   8
_journal_name_full               'Journal of natural products'
_journal_page_first              1839
_journal_paper_doi               10.1021/np500240b
_journal_volume                  77
_journal_year                    2014
_chemical_absolute_configuration rm
_chemical_formula_sum            'C20 H28 N2 O3'
_chemical_formula_weight         344.44
_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                   8.13883(13)
_cell_length_b                   10.17692(16)
_cell_length_c                   21.8799(3)
_cell_measurement_reflns_used    10171
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      62.6763
_cell_measurement_theta_min      4.3408
_cell_volume                     1812.27(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 16.0288
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Xcalibur, Sapphire3, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'Enhance Ultra (Cu) X-ray Source'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0225
_diffrn_reflns_av_sigmaI/netI    0.0140
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            14709
_diffrn_reflns_theta_full        62.77
_diffrn_reflns_theta_max         62.77
_diffrn_reflns_theta_min         4.79
_exptl_absorpt_coefficient_mu    0.679
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.78485
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.262
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.274
_refine_diff_density_min         -0.318
_refine_diff_density_rms         0.030
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.02(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     231
_refine_ls_number_reflns         2884
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0277
_refine_ls_R_factor_gt           0.0275
_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^)+(0.0442P)^2^+0.3103P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0738
_refine_ls_wR_factor_ref         0.0742
_reflns_number_gt                2851
_reflns_number_total             2884
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np500240b_si_004.cif
_cod_data_source_block           tangbenqin_gyh-x-8
_cod_depositor_comments
'Adding full bibliography for 1517377--1517381.cif.'
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               1517381