An interesting ring cleavage of 1,2,4-oxadiazole ring
Yu, Qiong; Cheng, Guangbin; Ju, Xuehai; Lu, Chunxu; Yang, Hongwei; New J. Chem. 41 (2017) 4797–4801; doi:10.1039/C7NJ01119A

data_7056204
_publ_section_title
;
 An interesting ring cleavage of 1,2,4-oxadiazole ring
;
_journal_issue                   12
_journal_name_full               'New J. Chem.'
_journal_page_first              4797
_journal_page_last               4801
_journal_paper_doi               10.1039/C7NJ01119A
_journal_volume                  41
_journal_year                    2017
_chemical_formula_moiety         'C4 H5 N7 O10'
_chemical_formula_sum            'C4 H5 N7 O10'
_chemical_formula_weight         311.15
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-05-11 deposited with the CCDC.
2017-05-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 109.113(3)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   7.1401(11)
_cell_length_b                   7.8040(13)
_cell_length_c                   10.6428(19)
_cell_measurement_reflns_used    713
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      21.57
_cell_measurement_theta_min      3.02
_cell_volume                     560.34(16)
_computing_cell_refinement       APEX2
_computing_data_collection       'APEX2 (Bruker, 2011)'
_computing_data_reduction        APEX2
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS97 (Bruker, 2000)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.966
_diffrn_measured_fraction_theta_max 0.963
_diffrn_measurement_device_type  'APEX2 CCD detector'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0298
_diffrn_reflns_av_unetI/netI     0.0672
_diffrn_reflns_Laue_measured_fraction_full 0.966
_diffrn_reflns_Laue_measured_fraction_max 0.963
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            3208
_diffrn_reflns_point_group_measured_fraction_full 0.956
_diffrn_reflns_point_group_measured_fraction_max 0.952
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.723
_diffrn_reflns_theta_min         2.025
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    0.183
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.6652
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2008)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.844
_exptl_crystal_description       block
_exptl_crystal_F_000             316
_exptl_crystal_size_max          0.180
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.150
_refine_diff_density_max         0.186
_refine_diff_density_min         -0.237
_refine_diff_density_rms         0.053
_refine_ls_abs_structure_details
;
 Flack x determined using 550 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -1.8(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         2028
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0694
_refine_ls_R_factor_gt           0.0444
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0231P)^2^+0.2110P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0763
_refine_ls_wR_factor_ref         0.0870
_reflns_Friedel_coverage         0.837
_reflns_Friedel_fraction_full    0.944
_reflns_Friedel_fraction_max     0.939
_reflns_number_gt                1528
_reflns_number_total             2028
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7nj01119a2.cif
_cod_data_source_block           2
_cod_database_code               7056204
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.968
_shelx_estimated_absorpt_t_max   0.973
_shelx_res_checksum              87609