An approach to the skeleton of aspidophylline a.
Li, Qi; Li, Guang; Ma, Shaobo; Feng, Pengju; Shi, Yian; Organic letters 15 (2013) 2601–2603; doi:10.1021/ol4007713

data_1512032
_publ_section_title
;
 An approach to the skeleton of aspidophylline a.
;
_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2601
_journal_page_last               2603
_journal_paper_doi               10.1021/ol4007713
_journal_volume                  15
_journal_year                    2013
_chemical_formula_moiety         'C17 H18 N4 O3'
_chemical_formula_sum            'C17 H18 N4 O3'
_chemical_formula_weight         326.35
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                95.38(3)
_cell_angle_beta                 96.01(3)
_cell_angle_gamma                107.25(3)
_cell_formula_units_Z            2
_cell_length_a                   6.8452(14)
_cell_length_b                   8.3203(17)
_cell_length_c                   14.503(3)
_cell_measurement_reflns_used    2971
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4658
_cell_measurement_theta_min      1.4242
_cell_volume                     777.7(3)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics
;
 Mercury: visualization and analysis of crystal structures, C. F. Macrae,
 P. R. Edgington, P. McCabe, E. Pidcock, G. P. Shields, R. Taylor,
 M. Towler and J. van de Streek, J. Appl. Cryst., 39, 453-457, 2006.
;
_computing_publication_material  'SHELX-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELX-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELX-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'MM007HF + CCD (Saturn724+)'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  Confocal
_diffrn_radiation_source         'Rotating Anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0447
_diffrn_reflns_av_sigmaI/netI    0.0356
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            10387
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         2.59
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7308
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.394
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             344
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.313
_refine_diff_density_min         -0.182
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         3540
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.076
_refine_ls_R_factor_all          0.0469
_refine_ls_R_factor_gt           0.0438
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0444P)^2^+0.2649P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1057
_refine_ls_wR_factor_ref         0.1081
_reflns_number_gt                3332
_reflns_number_total             3540
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol4007713_si_002.cif
_cod_data_source_block           a
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               1512032