Immunosuppressive Nor-isopimarane Diterpenes from Cultures of the Fungicolous Fungus <i>Xylaria longipes</i> HFG1018.
Chen, He-Ping; Zhao, Zhen-Zhu; Cheng, Gui-Guang; Zhao, Kuan; Han, Kai-Yue; Zhou, Lin; Feng, Tao; Li, Zheng-Hui; Liu, Ji-Kai; Journal of natural products  (2020) –; doi:10.1021/acs.jnatprod.9b00889

data_1557139
_publ_section_title
;
 Immunosuppressive Nor-isopimarane Diterpenes from Cultures of the
 Fungicolous Fungus <i>Xylaria longipes</i> HFG1018.
;
_journal_name_full               'Journal of natural products'
_journal_paper_doi               10.1021/acs.jnatprod.9b00889
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C19 H30 O3'
_chemical_formula_sum            'C19 H30 O3'
_chemical_formula_weight         306.43
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.8215(6)
_cell_length_b                   10.0565(8)
_cell_length_c                   24.1425(19)
_cell_measurement_reflns_used    9295
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      70.25
_cell_measurement_theta_min      3.66
_cell_volume                     1656.2(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.969
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0383
_diffrn_reflns_av_unetI/netI     0.0332
_diffrn_reflns_Laue_measured_fraction_full 0.982
_diffrn_reflns_Laue_measured_fraction_max 0.969
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            9890
_diffrn_reflns_point_group_measured_fraction_full 0.978
_diffrn_reflns_point_group_measured_fraction_max 0.959
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         70.248
_diffrn_reflns_theta_min         3.661
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.638
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.229
_exptl_crystal_description       prism
_exptl_crystal_F_000             672
_exptl_crystal_size_max          1.100
_exptl_crystal_size_mid          0.350
_exptl_crystal_size_min          0.120
_exptl_transmission_factor_max   0.7533
_exptl_transmission_factor_min   0.4123
_refine_diff_density_max         0.202
_refine_diff_density_min         -0.213
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details
;
 Flack x determined using 1206 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.04(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.113
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     203
_refine_ls_number_reflns         3031
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.113
_refine_ls_R_factor_all          0.0371
_refine_ls_R_factor_gt           0.0368
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0528P)^2^+0.4088P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0986
_refine_ls_wR_factor_ref         0.0990
_reflns_Friedel_coverage         0.694
_reflns_Friedel_fraction_full    0.972
_reflns_Friedel_fraction_max     0.947
_reflns_number_gt                2996
_reflns_number_total             3031
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np9b00889_si_004.cif
_cod_data_source_block           cu_lchb27_0m
_cod_database_code               1557139
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.541
_shelx_estimated_absorpt_t_max   0.927
_shelx_res_checksum              83916
_shelx_hkl_checksum              19958