β-Phenylproline: the high β-turn forming propensity of proline combined with an aromatic side chain.
Fatás, Paola; Jiménez, Ana I; Calaza, M. Isabel; Cativiela, Carlos; Organic & biomolecular chemistry 10 (2012) 640–651; doi:10.1039/c1ob06561k

data_7152171
_publ_section_title
;
 \b-Phenylproline: the high \b-turn forming propensity of proline combined
 with an aromatic side chain.
;
_journal_issue                   3
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              640
_journal_page_last               651
_journal_paper_doi               10.1039/c1ob06561k
_journal_volume                  10
_journal_year                    2012
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C26 H33 N3 O4'
_chemical_formula_sum            'C26 H33 N3 O4'
_chemical_formula_weight         451.55
_chemical_name_systematic
;
(2S,3R)-N-(tert-butoxycarbonyl)-3-phenylprolyl-(R)-N'-methylphenylalaninamide
;
_space_group_IT_number           4
_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                 97.1390(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.539(2)
_cell_length_b                   13.615(2)
_cell_length_c                   13.6874(17)
_cell_measurement_temperature    150(2)
_cell_volume                     2503.5(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.979
_diffrn_measured_fraction_theta_max 0.979
_diffrn_measurement_device_type  'Xcalibur, Sapphire3'
_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  0.0766
_diffrn_reflns_av_sigmaI/netI    0.1553
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            14654
_diffrn_reflns_theta_full        25.25
_diffrn_reflns_theta_max         25.25
_diffrn_reflns_theta_min         2.71
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             968
_exptl_crystal_size_max          0.59
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.158
_refine_diff_density_min         -0.201
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.873
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     597
_refine_ls_number_reflns         7271
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.873
_refine_ls_R_factor_all          0.1341
_refine_ls_R_factor_gt           0.0558
_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^)+(0.0414P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0906
_refine_ls_wR_factor_ref         0.1083
_reflns_number_gt                3686
_reflns_number_total             7271
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1ob06561k.txt
_cod_data_source_block           Boc-(S,R)-(betaPh)Pro-D-Phe-NHMe_compound_4a
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7152171