Orthanilic acid-promoted reverse turn formation in peptides
Sangram S. Kale; Gowri Priya; Amol S. Kotmale; Rupesh L. Gawade; Vedavati G. Puranik; P. R. Rajamohanan; Gangadhar J. Sanjayan; Chemical communications (Cambridge, England) 49 (2013) 2222–2224; doi:10.1039/c3cc40522b

data_7108932
_publ_section_title
;
 Orthanilic acid-promoted reverse turn formation in peptides
;
_journal_issue                   22
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              2222
_journal_page_last               2224
_journal_paper_doi               10.1039/c3cc40522b
_journal_volume                  49
_journal_year                    2013
_chemical_formula_moiety         'C19 H30 N4 O6 S'
_chemical_formula_sum            'C19 H30 N4 O6 S'
_chemical_formula_weight         442.53
_chemical_melting_point          435.6(15)
_chemical_name_common            Peptide
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                109.363(13)
_cell_angle_beta                 92.148(11)
_cell_angle_gamma                111.533(7)
_cell_formula_units_Z            2
_cell_length_a                   8.4700(9)
_cell_length_b                   10.242(2)
_cell_length_c                   14.857(2)
_cell_measurement_reflns_used    2189
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      23.03
_cell_measurement_theta_min      2.23
_cell_volume                     1112.3(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL,PyMOL and PLATON'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0747
_diffrn_reflns_av_sigmaI/netI    0.0802
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            15904
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.23
_exptl_absorpt_coefficient_mu    0.187
_exptl_absorpt_correction_T_max  0.9779
_exptl_absorpt_correction_T_min  0.9237
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.321
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             472
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.548
_refine_diff_density_min         -0.327
_refine_diff_density_rms         0.063
_refine_ls_extinction_coef       0.0096(19)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     279
_refine_ls_number_reflns         3913
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.1014
_refine_ls_R_factor_gt           0.0546
_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^)+(0.0484P)^2^+0.8698P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1144
_refine_ls_wR_factor_ref         0.1338
_reflns_number_gt                2554
_reflns_number_total             3913
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3cc40522b.txt
_cod_data_source_block           C19H30N4O6Scompound3
_cod_depositor_comments
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The following automatic conversions were performed:

'_chemical_melting_point' value '161-164 degree centigrade' was
changed to '435.6(15)' - it was converted from degrees Celsius(C) to
Kelvins(K), the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1112.4(3)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7108932