Ethyl 5-isopropoxy-4-methyl-β-carboline-3-carboxylate: structural determinants of benzodiazepine-receptor antagonism
Camerman, Arthur; Mastropaolo, Donald; Hempel, Andrew; Camerman, Norman; Acta Crystallographica Section C 61 (2005) o265–o266; doi:10.1107/S0108270105005457

data_2014832
_publ_section_title
;
 Ethyl 5-isopropoxy-4-methyl-\b-carboline-3-carboxylate: structural
 determinants of benzodiazepine-receptor antagonism
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o265
_journal_page_last               o266
_journal_paper_doi               10.1107/S0108270105005457
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C18 H20 N2 O3'
_chemical_formula_moiety         'C18 H20 N2 O3'
_chemical_formula_sum            'C18 H20 N2 O3'
_chemical_formula_weight         312.36
_chemical_name_systematic
;
Ethyl 5-isopropoxy-4-methyl-\b-carboline-3-carboxylate
;
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 104.46(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.5190(9)
_cell_length_b                   16.2110(15)
_cell_length_c                   11.862(2)
_cell_measurement_reflns_used    32
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      22
_cell_measurement_theta_min      10
_cell_volume                     1586.3(4)
_computing_cell_refinement       'CAD-4 Software'
_computing_data_collection       'CAD-4 Software (Enraf--Nonius, 1989)'
_computing_data_reduction        'DATRDN The X-ray System, (Stewart, 1976)'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'MULTAN80 (Main <i>et al.</i>, 1980)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       '\w /2\q  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    0.0433
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2777
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.17
_diffrn_standards_decay_%        1
_diffrn_standards_interval_count 100
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.308
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.243
_refine_diff_density_min         -0.185
_refine_ls_extinction_method     none
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_refine_ls_R_factor_all          0.0558
_refine_ls_R_factor_gt           0.0394
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0451P)^2^+0.3655P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0965
_refine_ls_wR_factor_ref         0.1074
_reflns_number_gt                2135
_reflns_number_total             2777
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            gd1376.cif
_cod_data_source_block           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:

'_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2014832
_cod_database_fobs_code          2014832