Taxodisones A and B: bioactive C<sub>30</sub>-terpenes with new skeletons from Taxodium distichum and their biosynthetic origin.
Wang, Wen-Li; Liu, Xiao-Qin; Zhang, Mei-Hui; Lin, Bin; Zhu, Dong-Rong; Li, Ling-Nan; Chen, Chen; Han, Chao; Luo, Jian-Guang; Kong, Ling-Yi; Chemical communications (Cambridge, England) 56 (2020) 3329–3332; doi:10.1039/c9cc09433d

data_7125937
_publ_section_title
;
 Taxodisones A and B: bioactive C<sub>30</sub>-terpenes with new skeletons
 from Taxodium distichum and their biosynthetic origin.
;
_journal_issue                   22
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              3329
_journal_page_last               3332
_journal_paper_doi               10.1039/c9cc09433d
_journal_volume                  56
_journal_year                    2020
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C30 H42 O3'
_chemical_formula_sum            'C30 H42 O3'
_chemical_formula_weight         450.63
_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     dual
_audit_creation_date             2019-04-01
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2019-06-22 deposited with the CCDC.	2020-02-06 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.6085(10)
_cell_length_b                   18.276(3)
_cell_length_c                   18.693(2)
_cell_measurement_reflns_used    6509
_cell_measurement_temperature    298
_cell_measurement_theta_max      74.203
_cell_measurement_theta_min      6.280
_cell_volume                     2599.3(6)
_computing_cell_refinement       'SAINT V8.38A (?, 2016)'
_computing_data_reduction        'SAINT V8.38A (?, 2016)'
_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    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      298
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0380
_diffrn_reflns_av_unetI/netI     0.0193
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            43496
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         74.837
_diffrn_reflns_theta_min         3.382
_exptl_absorpt_coefficient_mu    0.560
_exptl_absorpt_correction_T_max  0.7537
_exptl_absorpt_correction_T_min  0.6899
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1266 before and 0.0579 after correction. The Ratio of minimum to maximum transmission is 0.9154. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.152
_exptl_crystal_description       plate
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.152
_refine_diff_density_min         -0.094
_refine_diff_density_rms         0.024
_refine_ls_abs_structure_details
;
 Flack x determined using 2035 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.05(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     306
_refine_ls_number_reflns         5309
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0340
_refine_ls_R_factor_gt           0.0316
_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^)+(0.0494P)^2^+0.2126P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0851
_refine_ls_wR_factor_ref         0.0870
_reflns_Friedel_coverage         0.754
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.990
_reflns_number_gt                4974
_reflns_number_total             5309
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9cc09433d2.cif
_cod_data_source_block           22019284_0m
_cod_depositor_comments
'Adding full bibliography for 7125937--7125938.cif.'
_cod_original_cell_volume        2599.4(6)
_cod_database_code               7125937
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.994
_shelx_estimated_absorpt_t_min   0.957
_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:
 C5(H5), C7(H7), C15(H15)
2.b Secondary CH2 refined with riding coordinates:
 C4'(H4'A,H4'B), C2(H2A,H2B), C10'(H10A,H10B), C1'(H1'A,H1'B), C5'(H5'A,H5'B),
 C3(H3A,H3B), C1(H1A,H1B)
2.c Aromatic/amide H refined with riding coordinates:
 C14(H14), C2'(H2'), C6'(H6')
2.d Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C20(H20A,H20B,H20C), C19(H19A,H19B,H19C), C9'(H9'A,H9'B,
 H9'C), C18(H18A,H18B,H18C), C17(H17A,H17B,H17C), C8'(H8'A,H8'B,H8'C)
2.e Idealised tetrahedral OH refined as rotating group:
 O2(H2)
;
_olex2_submission_special_instructions 'No special instructions were received'