Crystal structure of 1,2,5-trimethyl-1,2,3,4-tetrahydropyrido[4,3- b]carbazole (guatambuine), C~18~H~20~N~2~, from Aspidosperma subincanum Mart.
De Simone, C. A.; Malta, V. R. S.; Lamenha, G. S.; Humberto, M. M. S.; Porto, K. R. A.; Sant'Ana, A. E. G.; Zeitschrift für Kristallographie - New Crystal Structures 221 (2006) 233–234; doi:

data_8101978
_publ_section_title
;
Crystal structure of 1,2,5-trimethyl-1,2,3,4-tetrahydropyrido[4,3-
b]carbazole (guatambuine), C~18~H~20~N~2~, from Aspidosperma subincanum 
Mart.
;
_journal_issue                   2
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              233
_journal_page_last               234
_journal_volume                  221
_journal_year                    2006
_chemical_formula_sum            'C18 H20 N2'
_chemical_formula_weight         264.4
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'WinGX-Routine IMPORT-KappaCCD'
_cell_angle_alpha                90.000(5)
_cell_angle_beta                 90.000(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            4
_cell_length_a                   11.587(5)
_cell_length_b                   8.130(5)
_cell_length_c                   15.239(5)
_cell_measurement_reflns_used    2404
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.028
_cell_measurement_theta_min      2.91
_cell_volume                     1435.5(12)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction        'HKL Denzo/Scalep. (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep3 (Farrugia,1997)'
_computing_publication_material  'WinGX-Routine (Farrugia,1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick,1997)'
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  'Nonis KappaCCD'
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_radiation_monochromator  'horizonally mounted graphite crystal'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.058
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            4743
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         3.06
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.367
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             568
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.170
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.061
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     185
_refine_ls_number_reflns         2497
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_gt           0.0553
_refine_ls_shift/su_max          0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0567P)^2^+0.2105P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.1371
_reflns_number_gt                1830
_reflns_number_total             2497
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1267-1786.cff
_cod_data_source_block           karla1a
_cod_depositor_comments
;
The following automatic conversions were performed:
'_diffrn_radiation_probe' value 'X-ray' changed to 'x-ray' 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 1555 2011-01-17 13:19:09Z saulius 
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_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               8101978