#------------------------------------------------------------------------------
#$Date: 2008-04-05 11:13:02 +0300 (Sat, 05 Apr 2008) $
#$Revision: 340 $
#$URL: file:///home/coder/svn-repositories/cod/cif/2/2101521.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_2101521
loop_
_publ_author_name
'Kubicki, M.'
'Kindopp, T. W.'
'Capparelli, M. V.'
'Codding, P. W.'
_publ_section_title
;
 Hydrogen-bond patterns in 1,4-dihydro-2,3-quinoxalinediones: ligands
 for the glycine modulatory site on the NMDA receptor
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              487
_journal_page_last               499
_journal_volume                  52
_journal_year                    1996
_chemical_formula_sum            'C8 H4 Cl2 N2 O2'
_chemical_formula_weight         231.03
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_type_scat_source           IntTabC
_cell_angle_beta                 99.707(5)
_cell_formula_units_Z            4
_cell_length_a                   7.2066(5)
_cell_length_b                   8.4502(5)
_cell_length_c                   14.4709(7)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      44.30
_cell_measurement_theta_min      16.83
_cell_volume                     868.62(9)
_computing_cell_refinement       'SHELXL03 (Sheldrick, 1993)'
_computing_data_collection       'Enraf-Nonius CAD-4F'
_computing_data_reduction        'ENDROC (Rettig, 1978)'
_computing_structure_refinement  'SHELXL93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_measurement_device       'Enraf-Nonius CAD-4F'
_diffrn_measurement_method       \w-2\q
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1680
_diffrn_reflns_theta_max         74.69
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_time  33.33
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    6.520
_exptl_absorpt_correction_T_max  0.461
_exptl_absorpt_correction_T_min  0.267
_exptl_absorpt_correction_type   'DIFABS (Walker & Stuart, 1983)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.767
_exptl_crystal_description       'elongated prism'
_exptl_crystal_F_000             464
_exptl_crystal_size_max          0.54
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.305
_refine_diff_density_min         -0.279
_refine_ls_extinction_coef       0.0140(10)
_refine_ls_extinction_method     'SHELXL93 (Sheldrick, 1993)'
_refine_ls_goodness_of_fit_obs   1.079
_refine_ls_hydrogen_treatment    refall
_refine_ls_number_parameters     144
_refine_ls_number_reflns         1677
_refine_ls_R_factor_obs          0.0280
_refine_ls_shift/esd_max         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_scheme
;w = 1/[\s^2^(F^2^) + 0.4497P]
where P = (F~o~^2^ + 2F~c~^2^)/3
;
_refine_ls_wR_factor_obs         0.0771
_reflns_number_observed          1676
_reflns_number_total             1680
_reflns_observed_criterion       I>2\s(I)
_[local]_cod_data_source_file    cr0473.cif
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
N(1) .2200(2) .6115(2) .34100(10) .0280(10)
C(2) .2628(2) .7601(2) .31830(10) .0290(10)
O(2) .2363(2) .8104(2) .23830(10) .0450(10)
C(3) .3547(2) .8661(2) .39770(10) .0280(10)
O(3) .4073(2) .99850(10) .37910(10) .0410(10)
N(4) .3771(2) .8055(2) .48490(10) .0280(10)
C(4A) .3183(2) .6545(2) .50600(10) .0240(10)
C(5) .3387(2) .6024(2) .59790(10) .0290(10)
C(6) .2807(2) .4515(2) .61680(10) .0300(10)
Cl(6) .30710(10) .38860(10) .73210(10) .0530(10)
C(7) .2040(2) .3518(2) .54350(10) .0280(10)
Cl(7) .13170(10) .16180(10) .56490(10) .0420(10)
C(8) .1836(2) .4031(2) .45200(10) .0270(10)
C(8A) .2402(2) .5549(2) .43280(10) .0230(10)
H(1) .187(3) .547(3) .2966(17) .047(6)
H(4) .433(3) .865(3) .5294(17) .043(6)
H(5) .390(3) .670(3) .6472(17) .047(6)
H(8) .137(3) .332(3) .4008(16) .045(6)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
N(1) C(2) 1.347(2)
N(1) C(8A) 1.396(2)
N(1) H(1) .85(2)
C(2) O(2) 1.218(2)
C(2) C(3) 1.518(2)
C(3) O(3) 1.225(2)
C(3) N(4) 1.346(2)
N(4) C(4A) 1.394(2)
N(4) H(4) .86(2)
C(4A) C(5) 1.386(2)
C(4A) C(8A) 1.395(2)
C(5) C(6) 1.383(2)
C(5) H(5) .94(2)
C(6) C(7) 1.394(2)
C(6) Cl(6) 1.731(2)
C(7) C(8) 1.377(2)
C(7) Cl(7) 1.732(2)
C(8) C(8A) 1.388(2)
C(8) H(8) .97(2)
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
C(2) N(1) C(8A) 124.06(14)
C(2) N(1) H(1) 118(2)
C(8A) N(1) H(1) 118(2)
O(2) C(2) N(1) 123.5(2)
O(2) C(2) C(3) 119.43(14)
N(1) C(2) C(3) 117.04(14)
O(3) C(3) N(4) 124.1(2)
O(3) C(3) C(2) 119.0(2)
N(4) C(3) C(2) 116.89(13)
C(3) N(4) C(4A) 124.13(14)
C(3) N(4) H(4) 117(2)
C(4A) N(4) H(4) 119(2)
C(5) C(4A) N(4) 120.96(14)
C(5) C(4A) C(8A) 120.04(14)
N(4) C(4A) C(8A) 118.99(14)
C(6) C(5) C(4A) 119.7(2)
C(6) C(5) H(5) 120.4(14)
C(4A) C(5) H(5) 119.9(14)
C(5) C(6) C(7) 120.1(2)
C(5) C(6) Cl(6) 119.09(13)
C(7) C(6) Cl(6) 120.84(13)
C(8) C(7) C(6) 120.40(14)
C(8) C(7) Cl(7) 118.46(12)
C(6) C(7) Cl(7) 121.14(13)
C(7) C(8) C(8A) 119.68(14)
C(7) C(8) H(8) 120.5(13)
C(8A) C(8) H(8) 119.7(13)
C(8) C(8A) C(4A) 120.05(14)
C(8) C(8A) N(1) 121.31(14)
C(4A) C(8A) N(1) 118.63(13)