Engineering the Structure of an N-Terminal β-Turn To Maximize Screw-Sense Preference in Achiral Helical Peptide Chains.
De Poli, Matteo; Byrne, Liam; Brown, Robert A.; Solà, Jordi; Castellanos, Alejandro; Boddaert, Thomas; Wechsel, Romina; Beadle, Jonathan D.; Clayden, Jonathan; The Journal of organic chemistry 79 (2014) 4659–4675; doi:10.1021/jo500714b

data_4029368
_publ_section_title
;
 Engineering the Structure of an N-Terminal \b-Turn To Maximize
 Screw-Sense Preference in Achiral Helical Peptide Chains.
;
_journal_issue                   10
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              4659
_journal_page_last               4675
_journal_paper_doi               10.1021/jo500714b
_journal_volume                  79
_journal_year                    2014
_chemical_absolute_configuration syn
_chemical_formula_sum            'C26 H49 N7 O9'
_chemical_formula_weight         603.72
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 94.9510(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.7586(3)
_cell_length_b                   11.7537(2)
_cell_length_c                   17.0863(3)
_cell_measurement_reflns_used    4794
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      68.52
_cell_measurement_theta_min      3.54
_cell_volume                     3353.03(10)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0332
_diffrn_reflns_av_sigmaI/netI    0.0416
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            16977
_diffrn_reflns_theta_full        66.60
_diffrn_reflns_theta_max         68.58
_diffrn_reflns_theta_min         2.65
_exptl_absorpt_coefficient_mu    0.754
_exptl_absorpt_correction_T_max  0.9562
_exptl_absorpt_correction_T_min  0.797363
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.196
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1304
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.831
_refine_diff_density_min         -0.517
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.1(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     785
_refine_ls_number_reflns         8761
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0610
_refine_ls_R_factor_gt           0.0522
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0821P)^2^+1.4795P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1409
_refine_ls_wR_factor_ref         0.1470
_reflns_number_gt                7614
_reflns_number_total             8761
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo500714b_si_004.cif
_cod_data_source_block           s3876ma
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

 Adding full bibliography for 4029365--4029371.cif.
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               4029368