Nardoaristolones A and B, Two Terpenoids with Unusual Skeletons from Nardostachys chinensis Batal.
Liu, Ming-Li; Duan, Ying-Hui; Hou, Yun-Long; Li, Chang; Gao, Hao; Dai, Yi; Yao, Xin-Sheng; Organic letters 15 (2013) 1000–1003; doi:10.1021/ol3034466

data_1508937
_publ_section_title
;
 Nardoaristolones A and B, Two Terpenoids with Unusual Skeletons from
 Nardostachys chinensis Batal.
;
_journal_issue                   5
_journal_name_full               'Organic letters'
_journal_page_first              1000
_journal_page_last               1003
_journal_paper_doi               10.1021/ol3034466
_journal_volume                  15
_journal_year                    2013
_chemical_absolute_configuration unk
_chemical_formula_sum            'C14 H18 O2'
_chemical_formula_weight         218.28
_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                   8.06899(12)
_cell_length_b                   9.64395(14)
_cell_length_c                   15.6052(3)
_cell_measurement_reflns_used    7033
_cell_measurement_temperature    157(2)
_cell_measurement_theta_max      62.5310
_cell_measurement_theta_min      4.5812
_cell_volume                     1214.35(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      157(2)
_diffrn_detector_area_resol_mean 16.0288
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Xcalibur, Sapphire3, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'Enhance Ultra (Cu) X-ray Source'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0178
_diffrn_reflns_av_sigmaI/netI    0.0113
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            9341
_diffrn_reflns_theta_full        62.62
_diffrn_reflns_theta_max         62.62
_diffrn_reflns_theta_min         5.39
_exptl_absorpt_coefficient_mu    0.619
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.85763
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.194
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             472
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.149
_refine_diff_density_min         -0.117
_refine_diff_density_rms         0.029
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.086
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     149
_refine_ls_number_reflns         1916
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.086
_refine_ls_R_factor_all          0.0262
_refine_ls_R_factor_gt           0.0260
_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^)+(0.0417P)^2^+0.1618P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0684
_refine_ls_wR_factor_ref         0.0686
_reflns_number_gt                1904
_reflns_number_total             1916
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol3034466_si_003.cif
_cod_data_source_block           gh_e38b2a4
_cod_database_code               1508937