Mannolides A-C with an Intact Diterpenoid Skeleton Providing Insights on the Biosynthesis of Antitumor Cephalotaxus Troponoids.
Ni, Gang; Zhang, Hua; Fan, Yao-Yue; Liu, Hong-Chun; Ding, Jian; Yue, Jian-Min; Organic letters 18 (2016) 1880–1883; doi:10.1021/acs.orglett.6b00653

data_1543025
_publ_section_title
;
 Mannolides A-C with an Intact Diterpenoid Skeleton Providing Insights on
 the Biosynthesis of Antitumor Cephalotaxus Troponoids.
;
_journal_issue                   8
_journal_name_full               'Organic letters'
_journal_page_first              1880
_journal_page_last               1883
_journal_paper_doi               10.1021/acs.orglett.6b00653
_journal_volume                  18
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_sum            'C19 H16 O4'
_chemical_formula_weight         308.32
_space_group_crystal_system      monoclinic
_space_group_IT_number           5
_space_group_name_Hall           'C 2y'
_space_group_name_H-M_alt        'C 1 2 1'
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 1'
_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                 93.249(2)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   13.4613(5)
_cell_length_b                   9.1617(4)
_cell_length_c                   23.4678(9)
_cell_measurement_reflns_used    8263
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      65.22
_cell_measurement_theta_min      3.77
_cell_volume                     2889.6(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-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      133(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_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  0.0372
_diffrn_reflns_av_unetI/netI     0.0356
_diffrn_reflns_Laue_measured_fraction_full 0.988
_diffrn_reflns_Laue_measured_fraction_max 0.988
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            16356
_diffrn_reflns_point_group_measured_fraction_full 0.938
_diffrn_reflns_point_group_measured_fraction_max 0.938
_diffrn_reflns_theta_full        65.968
_diffrn_reflns_theta_max         65.968
_diffrn_reflns_theta_min         1.885
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.812
_exptl_absorpt_correction_T_max  0.9682
_exptl_absorpt_correction_T_min  0.8544
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.417
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1296
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.145
_refine_diff_density_min         -0.194
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details
;
 Flack x determined using 1806 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.01(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     419
_refine_ls_number_reflns         4727
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0379
_refine_ls_R_factor_gt           0.0351
_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^)+(0.0471P)^2^+1.2212P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0896
_refine_ls_wR_factor_ref         0.0916
_reflns_Friedel_coverage         0.779
_reflns_Friedel_fraction_full    0.882
_reflns_Friedel_fraction_max     0.882
_reflns_number_gt                4435
_reflns_number_total             4727
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol6b00653_si_005.cif
_cod_data_source_block           cu_dm12186_0m
_cod_depositor_comments
'Adding full bibliography for 1543021--1543025.cif.'
_cod_database_code               1543025
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.854
_shelx_estimated_absorpt_t_max   0.968
_shelx_res_checksum              87193
_shelx_hkl_checksum              13579