Scopariusic Acid, a New Meroditerpenoid with a Unique Cyclobutane Ring Isolated from Isodon scoparius.
Zhou, Min; Zhang, Hai-Bo; Wang, Wei-Guang; Gong, Ning-Bo; Zhan, Rui; Li, Xiao-Nian; Du, Xue; Li, Li-Mei; Li, Yan; Lu, Yang; Pu, Jian-Xin; Sun, Han-Dong; Organic letters 15 (2013) 4446–4449; doi:10.1021/ol401991u

data_1512301
_publ_section_title
;
 Scopariusic Acid, a New Meroditerpenoid with a Unique Cyclobutane Ring
 Isolated from Isodon scoparius.
;
_journal_issue                   17
_journal_name_full               'Organic letters'
_journal_page_first              4446
_journal_page_last               4449
_journal_paper_doi               10.1021/ol401991u
_journal_volume                  15
_journal_year                    2013
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C20 H32 O3, C H4 O'
_chemical_formula_sum            'C21 H36 O4'
_chemical_formula_weight         352.50
_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
_cell_angle_beta                 99.0959(10)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   6.819(3)
_cell_length_b                   7.317(5)
_cell_length_c                   19.999(10)
_cell_measurement_reflns_used    2280
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      72.20
_cell_measurement_theta_min      4.48
_cell_volume                     985.3(9)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics    'ORTEPII(Johnson,1976) and PLUTON(Spek,1990)'
_computing_publication_material  'SHELXL97(Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_detector_area_resol_mean 0
_diffrn_measured_fraction_theta_full 0.976
_diffrn_measured_fraction_theta_max 0.976
_diffrn_measurement_device_type  CCD
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  Multilayer
_diffrn_radiation_source         'Sealed Tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0565
_diffrn_reflns_av_sigmaI/netI    0.0566
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -3
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            7785
_diffrn_reflns_theta_full        72.20
_diffrn_reflns_theta_max         72.20
_diffrn_reflns_theta_min         4.48
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.635
_exptl_absorpt_correction_T_max  0.870
_exptl_absorpt_correction_T_min  0.833
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.188
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             388
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.290
_refine_diff_density_min         -0.309
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.1(3)
_refine_ls_extinction_coef       0.0052(15)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         2554
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0536
_refine_ls_R_factor_gt           0.0463
_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^)+(0.0888P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1245
_refine_ls_wR_factor_ref         0.1319
_reflns_number_gt                2280
_reflns_number_total             2554
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol401991u_si_004.cif
_cod_data_source_block           5254
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' 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 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               1512301