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_7152170
_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 O3'
_chemical_formula_sum            'C26 H33 N3 O3'
_chemical_formula_weight         435.55
_chemical_name_systematic
;
(2S,3R)-N-(tert-butylcarbonyl)-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                 93.060(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.6700(3)
_cell_length_b                   12.4890(5)
_cell_length_c                   19.8078(7)
_cell_measurement_temperature    150(2)
_cell_volume                     2388.75(15)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0378
_diffrn_reflns_av_sigmaI/netI    0.0764
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            17815
_diffrn_reflns_theta_full        26.50
_diffrn_reflns_theta_max         26.50
_diffrn_reflns_theta_min         3.03
_exptl_absorpt_coefficient_mu    0.080
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.78435
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.211
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             936
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.189
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.039
_refine_ls_extinction_coef       0.0037(5)
_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   1.040
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     580
_refine_ls_number_reflns         9060
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.040
_refine_ls_R_factor_all          0.0856
_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^)+(0.0342P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0912
_refine_ls_wR_factor_ref         0.1037
_reflns_number_gt                6679
_reflns_number_total             9060
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1ob06561k.txt
_cod_data_source_block           Piv-(S,R)-(betaPh)Pro-D-Phe-NHMe_compound_4
_cod_original_cell_volume        2388.77(15)
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7152170