Structural studies of model peptides containing ?-, ?- and ?-amino acids
Sengupta, Anindita; Aravinda, Subrayashastry; Shamala, Narayanaswamy; Raja, K. Muruga Poopathi; Balaram, Padmanabhan; Organic & Biomolecular Chemistry 4 (2006) 4214–; doi:10.1039/b609863k

data_7151308
_publ_section_title
;
 Structural studies of model peptides containing ?-, ?- and ?-amino
 acids
;
_journal_issue                   22
_journal_name_full               'Organic &amp;  Biomolecular Chemistry'
_journal_page_first              4214
_journal_paper_doi               10.1039/b609863k
_journal_volume                  4
_journal_year                    2006
_chemical_formula_moiety         'C14 H24 N2 O5'
_chemical_formula_sum            'C14 H24 N2 O5'
_chemical_formula_weight         300.35
_chemical_name_common
't-butyloxycarbonyl-prolyl-gaba-aminobutyric acid'
_chemical_name_systematic
;
t-butyloxycarbonyl-prolyl-gaba-aminobutyric acid
;
_space_group_IT_number           169
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  'P 61'
_symmetry_space_group_name_H-M   'P 61'
_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                120.00
_cell_formula_units_Z            6
_cell_length_a                   9.7591(16)
_cell_length_b                   9.7591(16)
_cell_length_c                   29.158(10)
_cell_measurement_temperature    293(2)
_cell_volume                     2405.0(10)
_computing_data_collection       SMART
_computing_data_reduction        SAINT
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.968
_diffrn_measured_fraction_theta_max 0.968
_diffrn_measurement_device_type  'BRUKER AXS SMART APEX CCD with Mo source'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1109
_diffrn_reflns_av_sigmaI/netI    0.0505
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -37
_diffrn_reflns_number            19265
_diffrn_reflns_theta_full        27.40
_diffrn_reflns_theta_max         27.40
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.244
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             972
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.187
_refine_diff_density_min         -0.153
_refine_diff_density_rms         0.042
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   10(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.263
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         1809
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.263
_refine_ls_R_factor_all          0.0990
_refine_ls_R_factor_gt           0.0773
_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^)+(0.0547P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1243
_refine_ls_wR_factor_ref         0.1306
_reflns_number_gt                1537
_reflns_number_total             1809
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b609863k.txt
_cod_data_source_block           bgabu
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Hexagonal' changed to 'hexagonal'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      P6(1)
_cod_database_code               7151308