Przewalskin B, a novel diterpenoid with an unprecedented skeleton from Salvia przewalskii maxim.
Xu, Gang; Hou, Ai-Jun; Zheng, Yong-Tang; Zhao, Yu; Li, Xiao-Li; Peng, Li-Yan; Zhao, Qin-Shi; Organic letters 9 (2007) 291–293; doi:10.1021/ol062748d

data_1505260
_publ_section_title
;
 Przewalskin B, a novel diterpenoid with an unprecedented skeleton from
 Salvia przewalskii maxim.
;
_journal_issue                   2
_journal_name_full               'Organic letters'
_journal_page_first              291
_journal_page_last               293
_journal_paper_doi               10.1021/ol062748d
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C20 H26 O4'
_chemical_formula_weight         330.41
_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                   6.751
_cell_length_b                   11.662
_cell_length_c                   23.577
_cell_measurement_reflns_used    723
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      19.944
_cell_measurement_theta_min      2.456
_cell_volume                     1856.221
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_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  0.0890
_diffrn_reflns_av_sigmaI/netI    0.1052
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            9396
_diffrn_reflns_theta_full        27.21
_diffrn_reflns_theta_max         27.21
_diffrn_reflns_theta_min         1.73
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  0.9919
_exptl_absorpt_correction_T_min  0.9879
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.182
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.279
_refine_diff_density_min         -0.180
_refine_diff_density_rms         0.072
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -2(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.910
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     222
_refine_ls_number_reflns         4052
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.910
_refine_ls_R_factor_all          0.1436
_refine_ls_R_factor_gt           0.0752
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0631P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1421
_refine_ls_wR_factor_ref         0.1671
_reflns_number_gt                1983
_reflns_number_total             4052
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol062748dsi20061111_010318.cif
_cod_data_source_block           f60512a
_cod_depositor_comments
;
The following automatic conversions were performed:
'_atom_site_symetry_multiplicity' tag replaced with
'_atom_site_symmetry_multiplicity'.

Automatic conversion script
Id: cif_correct_tags 1440 2010-10-19 06:21:57Z saulius 
;
_cod_original_cell_volume        1856.2
_cod_database_code               1505260