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_1544491
_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         'C25 H36 O9'
_chemical_formula_sum            'C25 H36 O9'
_chemical_formula_weight         480.54
_chemical_name_systematic
;
 ?
;
_space_group_crystal_system      trigonal
_space_group_IT_number           154
_space_group_name_Hall           'P 32 2"'
_space_group_name_H-M_alt        'P 32 2 1'
_symmetry_space_group_name_Hall  'P 32 2"'
_symmetry_space_group_name_H-M   'P 32 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2015-04-21
_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                120
_cell_formula_units_Z            12
_cell_length_a                   18.4959(2)
_cell_length_b                   18.4959(2)
_cell_length_c                   28.8516(5)
_cell_measurement_reflns_used    6324
_cell_measurement_temperature    130
_cell_measurement_theta_max      66.91
_cell_measurement_theta_min      4.12
_cell_volume                     8547.7(2)
_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    'XM (Sheldrick, 2008)'
_diffrn_ambient_temperature      130
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.992
_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  0.0761
_diffrn_reflns_av_unetI/netI     0.0738
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.992
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            43606
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.981
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         69.685
_diffrn_reflns_theta_min         4.124
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.703
_exptl_absorpt_correction_T_max  0.7533
_exptl_absorpt_correction_T_min  0.4622
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.1545 before and 0.0688 after correction.
The Ratio of minimum to maximum transmission is 0.6136.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.120
_exptl_crystal_description       prism
_exptl_crystal_F_000             3096
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.861
_refine_diff_density_min         -0.480
_refine_diff_density_rms         0.070
_refine_ls_abs_structure_details
;
 Flack x determined using 3131 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.12(10)
_refine_ls_extinction_coef       0.00057(19)
_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   1.087
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     629
_refine_ls_number_reflns         10543
_refine_ls_number_restraints     46
_refine_ls_restrained_S_all      1.107
_refine_ls_R_factor_all          0.0996
_refine_ls_R_factor_gt           0.0875
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1597P)^2^+2.1835P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2443
_refine_ls_wR_factor_ref         0.2594
_reflns_Friedel_coverage         0.802
_reflns_Friedel_fraction_full    0.988
_reflns_Friedel_fraction_max     0.968
_reflns_number_gt                8396
_reflns_number_total             10543
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np6b00315_si_007.cif
_cod_data_source_block           cu_dm15019_0m
_cod_database_code               1544491
_shelxl_version_number           2014-3
_shelx_estimated_absorpt_t_max   0.966
_shelx_estimated_absorpt_t_min   0.872
_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. Restrained distances
 C1'-C2' = C2'-C5'
 1.5 with sigma of 0.01
 C3'-C4'
 1.53 with sigma of 0.01
 C2'-C4'
 2.3 with sigma of 0.01
3. Uiso/Uaniso restraints and constraints
C1' \\sim C2' \\sim C3' \\sim C5': within 2A with sigma of 0.005 and sigma for
terminal atoms of 0.01
Uanis(C1') \\sim Ueq, Uanis(C2') \\sim Ueq, Uanis(C5') \\sim Ueq, Uanis(C3')
\\sim Ueq: with sigma of 0.005 and sigma for terminal atoms of 0.01
4.a Ternary CH refined with riding coordinates:
 C2"A(H2"A), C2A(H2AB), C5A(H5A), C6A(H6A), C7A(H7A), C8A(H8A), C10A(H10A),
 C2(H2A), C5(H9A), C6(H8), C7(H7), C8(H6), C10(H4), C2"(H2')
4.b Secondary CH2 refined with riding coordinates:
 C3"A(H3"A,H3"B), C1A(H1AA,H1AB), C3A(H3AA,H3AB), C1(H3A,H3B), C3(H1A,H1B),
 C3"(H3'A,H3'B)
4.c Aromatic/amide H refined with riding coordinates:
 C3'A(H3'C), C3'(H3")
4.d Tetrahedral OH refined with riding coordinates:
 O9A(H9AA)
4.e X=CH2 refined with riding coordinates:
 C13A(H13C,H13D), C13(H13A,H13B)
4.f Idealised Me refined as rotating group:
 C4"A(H4"D,H4"E,H4"F), C5"A(H5"D,H5"E,H5"F), C4'A(H4'C,H4'D,H4'E), C5'A(H5'D,
 H5'E,H5'F), C14A(H14D,H14E,H14F), C15A(H15D,H15E,H15F), C14(H15A,H15B,H15C),
 C15(H14A,H14B,H14C), C4"(H4",H4'A,H4'B), C5"(H5'A,H5'B,H5'C), C4'(H4"A,H4"B,
 H4"C), C5'(H5"A,H5"B,H5"C)
4.g Idealised tetrahedral OH refined as rotating group:
 O2A(H2AA), O2(H2), O9(H9)
;
_shelx_res_checksum              82156
_shelx_hkl_checksum              46541
_olex2_submission_special_instructions 'No special instructions were received'