17- nor-Cephalotane-Type Diterpenoids from Cephalotaxus fortunei.
Ge, Zhan-Peng; Liu, Hong-Chun; Wang, Guo-Cai; Liu, Qun-Fang; Xu, Cheng-Hui; Ding, Jian; Fan, Yao-Yue; Yue, Jian-Min; Journal of natural products 82 (2019) 1565–1575; doi:10.1021/acs.jnatprod.9b00059

data_1552660
_publ_section_title
;
 17- nor-Cephalotane-Type Diterpenoids from Cephalotaxus fortunei.
;
_journal_issue                   6
_journal_name_full               'Journal of natural products'
_journal_page_first              1565
_journal_page_last               1575
_journal_paper_doi               10.1021/acs.jnatprod.9b00059
_journal_volume                  82
_journal_year                    2019
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C19 H24 O4'
_chemical_formula_sum            'C19 H24 O4'
_chemical_formula_weight         316.38
_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             2018-09-28
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.0757(2)
_cell_length_b                   10.2698(2)
_cell_length_c                   16.8446(3)
_cell_measurement_reflns_used    9989
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      54.919
_cell_measurement_theta_min      4.388
_cell_volume                     1570.01(5)
_computing_cell_refinement       'SAINT v8.37A (Bruker, 2015)'
_computing_data_reduction        'SAINT v8.37A (Bruker, 2015)'
_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      169.98
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker D8 Venture'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           GaK\a
_diffrn_radiation_wavelength     1.34139
_diffrn_reflns_av_R_equivalents  0.0446
_diffrn_reflns_av_unetI/netI     0.0341
_diffrn_reflns_Laue_measured_fraction_full 0.987
_diffrn_reflns_Laue_measured_fraction_max 0.986
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            12577
_diffrn_reflns_point_group_measured_fraction_full 0.988
_diffrn_reflns_point_group_measured_fraction_max 0.987
_diffrn_reflns_theta_full        53.594
_diffrn_reflns_theta_max         54.904
_diffrn_reflns_theta_min         4.387
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.481
_exptl_absorpt_correction_T_max  0.7508
_exptl_absorpt_correction_T_min  0.5953
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1515 before and 0.0600 after correction. The Ratio of minimum to maximum transmission is 0.7929. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.338
_exptl_crystal_description       block
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.230
_refine_diff_density_min         -0.185
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details
;
 Flack x determined using 1173 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.10(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     211
_refine_ls_number_reflns         2950
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0329
_refine_ls_R_factor_gt           0.0317
_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^)+(0.0467P)^2^+0.2150P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0815
_refine_ls_wR_factor_ref         0.0825
_reflns_Friedel_coverage         0.730
_reflns_Friedel_fraction_full    0.990
_reflns_Friedel_fraction_max     0.987
_reflns_number_gt                2845
_reflns_number_total             2950
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np9b00059_si_004.cif
_cod_data_source_block           mjl18474_0m
_cod_database_code               1552660
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.963
_shelx_estimated_absorpt_t_min   0.931
_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), C2(H2), C4(H4), C8(H8), C10(H10), C12(H12), C14(H14)
2.b Secondary CH2 refined with riding coordinates:
 C3(H3A,H3B), C6(H6A,H6B), C7(H7A,H7B), C13(H13A,H13B), C15(H15A,H15B)
2.c Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C19(H19A,H19B,H19C)
2.d Idealised tetrahedral OH refined as rotating group:
 O3(H3)
;
_shelx_res_checksum              65128
_shelx_hkl_checksum              95346
_olex2_submission_special_instructions 'No special instructions were received'