Dehydroabietic acid
Rao, Xiao-Ping; Song, Zhan-Qian; Shang, Shi-Bin; Acta Crystallographica Section E 65 (2009) o2402–; doi:10.1107/S1600536809035600

data_2223263
_publ_section_title
;
 Dehydroabietic acid
;
_journal_coeditor_code           AT2868
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2402
_journal_paper_doi               10.1107/S1600536809035600
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C20 H28 O2'
_chemical_formula_moiety         'C20 H28 O2'
_chemical_formula_sum            'C20 H28 O2'
_chemical_formula_weight         300.42
_chemical_name_common            'Dehydroabietic acid'
_chemical_name_systematic
;
(1<i>R</i>,4a<i>S</i>,10a<i>R</i>)-7-isopropyl-1,4a-dimethyl-
1,2,3,4,4a,9,10,10a-octahydrophenanthrene-1-carboxylic acid
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 107.50(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.738(2)
_cell_length_b                   11.875(2)
_cell_length_c                   13.654(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13
_cell_measurement_theta_min      9
_cell_volume                     1815.1(7)
_computing_cell_refinement       'CAD-4 Software (Enraf--Nonius, 1985)'
_computing_data_collection       'CAD-4 Software (Enraf--Nonius, 1985)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_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  0.0855
_diffrn_reflns_av_sigmaI/netI    0.0465
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            3592
_diffrn_reflns_theta_full        25.15
_diffrn_reflns_theta_max         25.15
_diffrn_reflns_theta_min         1.56
_diffrn_standards_decay_%        1
_diffrn_standards_interval_count 200
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.069
_exptl_absorpt_correction_T_max  0.9864
_exptl_absorpt_correction_T_min  0.9730
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(XCAD4; Harms & Wocadlo, 1995)'
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.099
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.236
_refine_diff_density_min         -0.520
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     361
_refine_ls_number_reflns         3417
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.005
_refine_ls_R_factor_all          0.1125
_refine_ls_R_factor_gt           0.0770
_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^)+(0.06P)^2^+1.6P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1629
_refine_ls_wR_factor_ref         0.1817
_reflns_number_gt                2173
_reflns_number_total             3417
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            at2868.cif
_cod_data_source_block           I
_cod_original_cell_volume        1815.1(6)
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2223263
_cod_database_fobs_code          2223263