Structurally Diverse Sesquiterpenoids from the Endangered Ornamental Plant Michelia shiluensis.
Xiong, Juan; Wang, Li-Jun; Qian, Jianchang; Wang, Pei-Pei; Wang, Xue-Jiao; Ma, Guang-Lei; Zeng, Huaqiang; Li, Jia; Hu, Jin-Feng; Journal of natural products 81 (2018) 2195–2204; doi:10.1021/acs.jnatprod.8b00386

data_1553386
_publ_section_title
;
 Structurally Diverse Sesquiterpenoids from the Endangered Ornamental
 Plant Michelia shiluensis.
;
_journal_issue                   10
_journal_name_full               'Journal of natural products'
_journal_page_first              2195
_journal_page_last               2204
_journal_paper_doi               10.1021/acs.jnatprod.8b00386
_journal_volume                  81
_journal_year                    2018
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C18 H26 O7'
_chemical_formula_sum            'C18 H26 O7'
_chemical_formula_weight         354.39
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2016-12-23
_audit_creation_method
;
Olex2 1.2
(compiled 2016.11.30 svn.r3356 for OlexSys, GUI svn.r5269)
;
_cell_angle_alpha                90
_cell_angle_beta                 96.970(3)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.7912(6)
_cell_length_b                   7.2246(4)
_cell_length_c                   11.6007(6)
_cell_measurement_reflns_used    1579
_cell_measurement_temperature    296
_cell_measurement_theta_max      66.254
_cell_measurement_theta_min      3.839
_cell_volume                     897.73(8)
_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  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.976
_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  0.0517
_diffrn_reflns_av_unetI/netI     0.0596
_diffrn_reflns_Laue_measured_fraction_full 0.991
_diffrn_reflns_Laue_measured_fraction_max 0.976
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            7064
_diffrn_reflns_point_group_measured_fraction_full 0.765
_diffrn_reflns_point_group_measured_fraction_max 0.750
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         69.613
_diffrn_reflns_theta_min         3.839
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.838
_exptl_absorpt_correction_T_max  0.7532
_exptl_absorpt_correction_T_min  0.5222
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.1422 before and 0.0629 after correction.
The Ratio of minimum to maximum transmission is 0.6933.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.311
_exptl_crystal_description       prism
_exptl_crystal_F_000             380
_exptl_crystal_size_max          0.05
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.236
_refine_diff_density_min         -0.214
_refine_diff_density_rms         0.056
_refine_ls_abs_structure_details
;
 Flack x determined using 499 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.1(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.057
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     231
_refine_ls_number_reflns         2536
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.057
_refine_ls_R_factor_all          0.0625
_refine_ls_R_factor_gt           0.0505
_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^)+(0.1076P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1475
_refine_ls_wR_factor_ref         0.1590
_reflns_Friedel_coverage         0.415
_reflns_Friedel_fraction_full    0.496
_reflns_Friedel_fraction_max     0.482
_reflns_number_gt                2152
_reflns_number_total             2536
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np8b00386_si_004.cif
_cod_data_source_block           cu_dm16892_0m
_cod_database_code               1553386
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.992
_shelx_estimated_absorpt_t_min   0.959
_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:
 C1(H1), C5(H5A), C6(H6), C7(H7), C8(H8)
2.b Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B), C3(H3A,H3B), C9(H9A,H9B), C12(H12A,H12B)
2.c Idealised Me refined as rotating group:
 C14(H14A,H14B,H14C), C15(H15A,H15B,H15C), C16(H16A,H16B,H16C), C18(H18A,H18B,
 H18C)
2.d Idealised tetrahedral OH refined as rotating group:
 O5(H5)
;
_shelx_res_checksum              81292
_shelx_hkl_checksum              1585
_olex2_submission_special_instructions 'No special instructions were received'