Biomimetic Synthesis of Lankacidin Antibiotics.
Zheng, Kuan; Shen, Defeng; Hong, Ran; Journal of the American Chemical Society 139 (2017) 12939–12942; doi:10.1021/jacs.7b08500

data_4131676
_publ_section_title
;
 Biomimetic Synthesis of Lankacidin Antibiotics.
;
_journal_issue                   37
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12939
_journal_page_last               12942
_journal_paper_doi               10.1021/jacs.7b08500
_journal_volume                  139
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_sum            'C19 H29 N O5 S2 Si'
_chemical_formula_weight         443.64
_space_group_crystal_system      monoclinic
_space_group_IT_number           5
_space_group_name_Hall           'C 2y'
_space_group_name_H-M_alt        'C 1 2 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 121.446(7)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   23.701(4)
_cell_length_b                   6.8855(11)
_cell_length_c                   16.964(3)
_cell_measurement_reflns_used    2015
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      43.370
_cell_measurement_theta_min      4.925
_cell_volume                     2361.8(7)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0281
_diffrn_reflns_av_unetI/netI     0.0481
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6814
_diffrn_reflns_point_group_measured_fraction_full 0.986
_diffrn_reflns_point_group_measured_fraction_max 0.986
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.499
_diffrn_reflns_theta_min         1.755
_exptl_absorpt_coefficient_mu    0.304
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6440
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.170
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.528
_refine_diff_density_min         -0.236
_refine_diff_density_rms         0.062
_refine_ls_abs_structure_details
; 
 Flack x determined using 1350 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons and Flack (2004), Acta Cryst. A60, s61). 
;
_refine_ls_abs_structure_Flack   0.02(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     278
_refine_ls_number_reflns         4330
_refine_ls_number_restraints     41
_refine_ls_restrained_S_all      1.023
_refine_ls_R_factor_all          0.0708
_refine_ls_R_factor_gt           0.0590
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1053P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1513
_refine_ls_wR_factor_ref         0.1620
_reflns_Friedel_coverage         0.809
_reflns_Friedel_fraction_full    0.970
_reflns_Friedel_fraction_max     0.969
_reflns_number_gt                3558
_reflns_number_total             4330
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b08500_si_005.cif
_cod_data_source_block           cd17025
_cod_original_cell_volume        2361.9(7)
_cod_original_sg_symbol_H-M      'C 2'
_cod_database_code               4131676
_shelx_estimated_absorpt_t_min   0.942
_shelx_estimated_absorpt_t_max   0.962
_shelxl_version_number           2013-4
_shelx_res_checksum              66814
_shelx_hkl_checksum              94611