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_1552662
_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 H20 O4'
_chemical_formula_sum            'C19 H20 O4'
_chemical_formula_weight         312.35
_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   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2018-12-03
_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                   10.0126(3)
_cell_length_b                   11.8286(4)
_cell_length_c                   12.3462(4)
_cell_measurement_reflns_used    7987
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      54.871
_cell_measurement_theta_min      3.842
_cell_volume                     1462.22(8)
_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      170
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.997
_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  0.0367
_diffrn_reflns_av_unetI/netI     0.0303
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            10297
_diffrn_reflns_point_group_measured_fraction_full 0.992
_diffrn_reflns_point_group_measured_fraction_max 0.987
_diffrn_reflns_theta_full        53.594
_diffrn_reflns_theta_max         54.887
_diffrn_reflns_theta_min         4.504
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.516
_exptl_absorpt_correction_T_max  0.7508
_exptl_absorpt_correction_T_min  0.5964
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1495 before and 0.0571 after correction. The Ratio of minimum to maximum transmission is 0.7944. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.419
_exptl_crystal_description       block
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.161
_refine_diff_density_min         -0.150
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details
;
 Flack x determined using 1036 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.02(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.107
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         2740
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.107
_refine_ls_R_factor_all          0.0332
_refine_ls_R_factor_gt           0.0304
_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^)+(0.0313P)^2^+0.2306P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0713
_refine_ls_wR_factor_ref         0.0733
_reflns_Friedel_coverage         0.714
_reflns_Friedel_fraction_full    0.983
_reflns_Friedel_fraction_max     0.974
_reflns_number_gt                2600
_reflns_number_total             2740
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            np9b00059_si_005.cif
_cod_data_source_block           mjl18616_0m
_cod_database_code               1552662
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.975
_shelx_estimated_absorpt_t_min   0.941
_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(H1A), C2(H2), C4(H4)
2.b Secondary CH2 refined with riding coordinates:
 C3(H3A,H3B), C6(H6A,H6B), C7(H7A,H7B)
2.c Aromatic/amide H refined with riding coordinates:
 C13(H13), C15(H15)
2.d Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C19(H19A,H19B,H19C)
2.e Idealised tetrahedral OH refined as rotating group:
 O1(H1)
;
_shelx_res_checksum              50736
_shelx_hkl_checksum              21058
_olex2_submission_special_instructions 'No special instructions were received'