Aspidofractinine and Eburnane Alkaloids from a North Borneo Kopsia. Ring-Contracted, Additional Ring-Fused, and Paucidactine-Type Aspidofractinine Alkaloids from K. pauciflora.
Yap, Wai-Sum; Gan, Chew-Yan; Sim, Kae-Shin; Lim, Siew-Huah; Low, Yun-Yee; Kam, Toh-Seok; Journal of natural products 79 (2016) 230–239; doi:10.1021/acs.jnatprod.5b00992

data_1540729
_publ_section_title
;
 Aspidofractinine and Eburnane Alkaloids from a North Borneo Kopsia.
 Ring-Contracted, Additional Ring-Fused, and Paucidactine-Type
 Aspidofractinine Alkaloids from K. pauciflora.
;
_journal_issue                   1
_journal_name_full               'Journal of natural products'
_journal_page_first              230
_journal_page_last               239
_journal_paper_doi               10.1021/acs.jnatprod.5b00992
_journal_volume                  79
_journal_year                    2016
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C20 H22 N2 O3, C H4 O'
_chemical_formula_sum            'C21 H26 N2 O4'
_chemical_formula_weight         370.44
_chemical_melting_point          454.0(10)
_chemical_name_common            Paucidirinine
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.7581(2)
_cell_length_b                   11.4548(3)
_cell_length_c                   23.3157(6)
_cell_measurement_reflns_used    4942
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      29.44
_cell_measurement_theta_min      2.49
_cell_volume                     1804.93(9)
_computing_cell_refinement       'SAINT (Bruker, 2007)'
_computing_data_collection       'APEX2 (Bruker, 2007)'
_computing_data_reduction        'SAINT (Bruker, 2007)'
_computing_molecular_graphics    'X-SEED (Barbour, 2001)'
_computing_publication_material  'enCIFer (Allen et al., 2004)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0488
_diffrn_reflns_av_unetI/netI     0.0402
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            16954
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.005
_diffrn_reflns_theta_max         27.483
_diffrn_reflns_theta_min         1.747
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.9878
_exptl_absorpt_correction_T_min  0.9472
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, BRUKER (2006)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.363
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.580
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.251
_refine_diff_density_min         -0.243
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details
;
 Flack x determined using 1465 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.5(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.073
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     251
_refine_ls_number_reflns         4134
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.073
_refine_ls_R_factor_all          0.0430
_refine_ls_R_factor_gt           0.0361
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         <0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0534P)^2^+0.2556P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0885
_refine_ls_wR_factor_ref         0.0994
_reflns_Friedel_coverage         0.733
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                3719
_reflns_number_total             4134
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np5b00992_si_002.cif
_cod_data_source_block           Paucidirinine
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '453-455' was changed to '454.0(10)'
- the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 

 Adding full bibliography for 1540726--1540731.cif.
;
_cod_database_code               1540729
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.947
_shelx_estimated_absorpt_t_max   0.988
_shelx_res_checksum              72633
_shelx_hkl_checksum              1061