; Chemistry of Materials  (2003) –; doi:

data_4000269
_journal_name_full               'Chemistry of Materials'
_journal_year                    2003
_chemical_formula_sum            'C13 H14 N2 O4'
_chemical_formula_weight         262.26
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yab'
_symmetry_space_group_name_H-M   'P 1 21/a 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 108.770(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   19.176(2)
_cell_length_b                   5.537(4)
_cell_length_c                   25.025(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      12
_cell_measurement_theta_min      8
_cell_volume                     2515.8(18)
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean ?
_diffrn_measurement_device_type  cad4
_diffrn_measurement_method       omega-2-theta
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.70930
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0371
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3254
_diffrn_reflns_theta_max         22.42
_diffrn_reflns_theta_min         2.12
_diffrn_standards_decay_%        nil
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  1hr
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  ?
_exptl_absorpt_correction_T_min  ?
_exptl_absorpt_correction_type   ?
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.385
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1104
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.11
_refine_ls_extinction_coef       ?
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     455
_refine_ls_number_reflns         3254
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0613
_refine_ls_R_factor_gt           0.0400
_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^)+(0.0647P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0981
_refine_ls_wR_factor_ref         0.1056
_reflns_number_gt                2459
_reflns_number_total             3254
_reflns_threshold_expression     >2sigma(I)
_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.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0647P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0647P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/a'
_cod_database_code               4000269