Modifications of boronic ester pro-chelators triggered by hydrogen peroxide tune reactivity to inhibit metal-promoted oxidative stress.
Charkoudian, Louise K.; Pham, David M.; Kwon, Ashley M.; Vangeloff, Abbey D.; Franz, Katherine J.; Dalton transactions (Cambridge, England : 2003)  (2007) 5031–5042; doi:10.1039/b705199a

data_7005769
_publ_section_title
;
 Modifications of boronic ester pro-chelators triggered by hydrogen
 peroxide tune reactivity to inhibit metal-promoted oxidative stress.
;
_journal_issue                   43
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              5031
_journal_page_last               5042
_journal_paper_doi               10.1039/b705199a
_journal_year                    2007
_chemical_formula_moiety         '2(C22 H27 B N2 O4), 0.5(H4 O2)'
_chemical_formula_sum            'C44 H56 B2 N4 O9'
_chemical_formula_weight         806.55
_chemical_name_common            '[BSBH(m-OEt)]2 - H2O'
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 100.504(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.293(7)
_cell_length_b                   8.639(3)
_cell_length_c                   29.494(10)
_cell_measurement_reflns_used    1902
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      21.78
_cell_measurement_theta_min      3.07
_cell_volume                     4583(3)
_computing_cell_refinement       SAINT
_computing_data_collection       'Apex II 2.0 Rev.2 (Bruker, 2005)'
_computing_data_reduction        'SAINT 7.12A (Bruker, 2004)'
_computing_molecular_graphics    'SHELXTL 5.1, XP (Sheldrick, 1994)'
_computing_publication_material  'SHELXS-97 (Sheldrick, 1990)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker Kappa Apex II'
_diffrn_measurement_method       \w
_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    0.0755
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            8368
_diffrn_reflns_theta_full        25.38
_diffrn_reflns_theta_max         25.38
_diffrn_reflns_theta_min         3.07
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  0.9960
_exptl_absorpt_correction_T_min  0.9840
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2.10 (Sheldrick, 2004)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.169
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needles
_exptl_crystal_F_000             1720
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.357
_refine_diff_density_min         -0.488
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.074
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     534
_refine_ls_number_reflns         8368
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.080
_refine_ls_R_factor_all          0.1576
_refine_ls_R_factor_gt           0.0828
_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^)+(0.1338P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2349
_refine_ls_wR_factor_ref         0.2631
_reflns_number_gt                4048
_reflns_number_total             8368
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b705199a.txt
_cod_data_source_block           dp241
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan' changed
to 'multi-scan' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7005769