<i>Amaryllidaceae</i> Alkaloids: (+)-Tazettine, (+)-3-<i>O</i>-Demethylcriwelline and (+)-3-Epimacronine at 173 K
Linden, Anthony; Akineri, Gülnur; Noyan, Seda; Gözler, Tekant; Hesse, Manfred; Acta Crystallographica Section C 54 (1998) 1653–1659; doi:10.1107/S0108270198006933

data_2007806
_publ_section_title
;
 <i>Amaryllidaceae</i> Alkaloids: (+)-Tazettine,
 (+)-3-<i>O</i>-Demethylcriwelline and (+)-3-Epimacronine at 173 K
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1653
_journal_page_last               1659
_journal_paper_doi               10.1107/S0108270198006933
_journal_volume                  54
_journal_year                    1998
_chemical_formula_moiety         'C18 H21 N O5'
_chemical_formula_sum            'C18 H21 N O5'
_chemical_formula_weight         331.37
_chemical_melting_point          485
_chemical_name_common            (+)-tazettine
_chemical_name_systematic
;(+)-(3S,4aS,6aS,13bS)-3-methoxy-5-methyl-4,4a,5,6-tetrahydro-3H,8H-[1,3]dioxolo[
6,7][2]benzopyrano[3,4-c]indol-6a-ol
;
_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'
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.342(2)
_cell_length_b                   16.8390(10)
_cell_length_c                   7.052(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173.0(10)
_cell_measurement_theta_max      20.0
_cell_measurement_theta_min      18.5
_cell_volume                     1584.3(5)
_computing_cell_refinement       'MSC/AFC Diffractometer Control Software'
_computing_data_collection
;
MSC/AFC Diffractometer Control Software (Molecular Structure
Corporation, 1991)
;
_computing_data_reduction
'TEXSAN PROCESS (Molecular Structure Corporation, 1989)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173.0(10)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Rigaku AFC-5R'
_diffrn_measurement_method       \w-2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode generator'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.014
_diffrn_reflns_av_sigmaI/netI    0.0342
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            3176
_diffrn_reflns_theta_full        30.0
_diffrn_reflns_theta_max         30
_diffrn_reflns_theta_min         2.5
_diffrn_standards_decay_%        insignificant
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.102
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.389
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.27
_refine_diff_density_max         0.28
_refine_diff_density_min         -0.21
_refine_ls_extinction_coef       0.0061(18)
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 1997)'
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    'H atoms constrained'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     221
_refine_ls_number_reflns         3072
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.052
_refine_ls_R_factor_gt           0.039
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0596P)^2^+0.2133P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.109
_reflns_number_gt                2661
_reflns_number_total             3072
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fg1465.cif
_cod_data_source_block           I
_cod_original_cell_volume        1584.5(5)
_cod_database_code               2007806