Oxadiazole isomers: all bioisosteres are not created equal
Goldberg, Kristin; Groombridge, Sam; Hudson, Julian; Leach, Andrew G.; MacFaul, Philip A.; Pickup, Adrian; Poultney, Ruth; Scott, James S.; Svensson, Per H.; Sweeney, Joseph; MedChemComm 3 (2012) 600–; doi:10.1039/c2md20054f

data_7112575
_publ_section_title
;
 Oxadiazole isomers: all bioisosteres are not created equal
;
_journal_issue                   5
_journal_name_full               MedChemComm
_journal_page_first              600
_journal_paper_doi               10.1039/c2md20054f
_journal_volume                  3
_journal_year                    2012
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C19 H18 F2 N8 O2'
_chemical_formula_sum            'C19 H18 F2 N8 O2'
_chemical_formula_weight         428.41
_chemical_name_common
;
4-((2-(4-(5-(difluoromethyl)-1,2,4-oxadiazol-3-yl)-2-
methylpiperazin-1-yl) pyrimidin-5-yloxy)methyl)nicotinonitrile
;
_chemical_name_systematic
;
4-((2-(4-(5-(difluoromethyl)-1,2,4-
oxadiazol-3-yl)-2-methylpiperazin-1-yl)
pyrimidin-5-yloxy)methyl)nicotinonitrile
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.8535(17)
_cell_length_b                   11.759(3)
_cell_length_c                   24.167(8)
_cell_measurement_temperature    200(2)
_cell_volume                     1947.6(9)
_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      200(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0178
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2329
_diffrn_reflns_theta_full        26.49
_diffrn_reflns_theta_max         26.49
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    0.114
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.98
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'Bruker ApexII'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.461
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.228
_refine_diff_density_min         -0.303
_refine_diff_density_rms         0.107
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   1.1(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.113
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         2329
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.113
_refine_ls_R_factor_all          0.0411
_refine_ls_R_factor_gt           0.0317
_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^)+(0.0679P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0848
_refine_ls_wR_factor_ref         0.0999
_reflns_number_gt                2037
_reflns_number_total             2329
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2md20054f.txt
_cod_data_source_block           2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/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 
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_cod_database_code               7112575