Chemzymes: a new class of structurally rigid tricyclic amphibian organocatalyst inspired by natural product.
Xiao, Jian; Xu, Feng-Xia; Lu, Yun-Peng; Loh, Teck-Peng; Organic letters 12 (2010) 1220–1223; doi:10.1021/ol9029758

data_1503436
_publ_section_title
;
 Chemzymes: a new class of structurally rigid tricyclic amphibian
 organocatalyst inspired by natural product.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1220
_journal_page_last               1223
_journal_paper_doi               10.1021/ol9029758
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C15 H18 N2 O4'
_chemical_formula_sum            'C15 H18 N2 O4'
_chemical_formula_weight         290.31
_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           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                   7.9402(2)
_cell_length_b                   11.7992(3)
_cell_length_c                   15.7954(4)
_cell_measurement_reflns_used    8324
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      23.72
_cell_measurement_theta_min      2.58
_cell_volume                     1479.84(6)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0594
_diffrn_reflns_av_sigmaI/netI    0.0423
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            35185
_diffrn_reflns_theta_full        30.59
_diffrn_reflns_theta_max         30.59
_diffrn_reflns_theta_min         2.15
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.9858
_exptl_absorpt_correction_T_min  0.9812
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.303
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.225
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -10(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     196
_refine_ls_number_reflns         2575
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.0710
_refine_ls_R_factor_gt           0.0512
_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^)+(0.0634P)^2^+0.2885P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1272
_refine_ls_wR_factor_ref         0.1490
_reflns_number_gt                1922
_reflns_number_total             2575
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol9029758_si_001.cif
_cod_data_source_block           ltp58
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1503436