Isolation, Structure Elucidation, and Absolute Configuration of Highly Oxygenated Germacranolides from Carpesium cernuum.
Liu, Qing-Xin; Yang, Yong-Xun; Zhang, Jian-Ping; Chen, Li-Ping; Shen, Yun-Heng; Li, Hui-Liang; Zhang, Wei-Dong; Journal of natural products 79 (2016) 2479–2486; doi:10.1021/acs.jnatprod.6b00315

data_1544494
_publ_section_title
;
 Isolation, Structure Elucidation, and Absolute Configuration of Highly
 Oxygenated Germacranolides from Carpesium cernuum.
;
_journal_issue                   10
_journal_name_full               'Journal of natural products'
_journal_page_first              2479
_journal_page_last               2486
_journal_paper_doi               10.1021/acs.jnatprod.6b00315
_journal_volume                  79
_journal_year                    2016
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C23 H34 O8'
_chemical_formula_sum            'C23 H34 O8'
_chemical_formula_weight         438.50
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_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
_audit_creation_date             2015-07-16
_audit_creation_method
;
Olex2 1.2
(compiled 2015.01.26 svn.r3150 for OlexSys, GUI svn.r4998)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.71560(10)
_cell_length_b                   18.5622(2)
_cell_length_c                   23.1270(3)
_cell_measurement_reflns_used    6959
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      67.26
_cell_measurement_theta_min      3.05
_cell_volume                     2453.64(6)
_computing_cell_refinement       'SAINT v7.68A (Bruker, 2009)'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.964
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0420
_diffrn_reflns_av_unetI/netI     0.0300
_diffrn_reflns_Laue_measured_fraction_full 0.973
_diffrn_reflns_Laue_measured_fraction_max 0.964
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            15651
_diffrn_reflns_point_group_measured_fraction_full 0.961
_diffrn_reflns_point_group_measured_fraction_max 0.948
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.603
_diffrn_reflns_theta_min         3.053
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.737
_exptl_absorpt_correction_T_max  0.7531
_exptl_absorpt_correction_T_min  0.5849
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2008/1 (Bruker,2008) was used for absorption correction. wR2(int) was 0.1194 before and 0.0367 after correction. The Ratio of minimum to maximum transmission is 0.7767. The \l/2 correction factor is 0.0015.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.187
_exptl_crystal_description       block
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.181
_refine_diff_density_min         -0.188
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details
;
 Flack x determined using 1586 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.02(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     287
_refine_ls_number_reflns         4291
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0438
_refine_ls_R_factor_gt           0.0410
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0674P)^2^+0.2487P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1091
_refine_ls_wR_factor_ref         0.1125
_reflns_Friedel_coverage         0.693
_reflns_Friedel_fraction_full    0.944
_reflns_Friedel_fraction_max     0.927
_reflns_number_gt                4001
_reflns_number_total             4291
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np6b00315_si_006.cif
_cod_data_source_block           cu_dm15563_0m
_cod_database_code               1544494
_shelxl_version_number           2014-3
_shelx_estimated_absorpt_t_max   0.978
_shelx_estimated_absorpt_t_min   0.917
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C2"(H2"), C2'(H2'), C5(H5), C6(H6), C7(H7), C8(H8), C10(H10)
2.b Secondary CH2 refined with riding coordinates:
 C1(H1A,H1B), C2(H2A,H2B), C3(H3A,H3B)
2.c X=CH2 refined with riding coordinates:
 C13(H13A,H13B)
2.d Idealised Me refined as rotating group:
 C3"(H3"A,H3"B,H3"C), C3'(H3'A,H3'B,H3'C), C4"(H4"A,H4"B,H4"C), C4'(H4'A,H4'B,
 H4'C), C14(H14A,H14B,H14C), C15(H15A,H15B,H15C)
2.e Idealised tetrahedral OH refined as rotating group:
 O1(H1)
;
_shelx_res_checksum              85304
_shelx_hkl_checksum              45515
_olex2_submission_special_instructions 'No special instructions were received'