Conformation-Activity Relationships in Polyketide Natural Products: A New Perspective on the Rational Design of Epothilone Analogues
Richard E. Taylor; Yue Chen; Alicia Beatty; David C. Myles; Yiqing Zhou; Journal of the American Chemical Society 125 (2003) 26–27; doi:10.1021/ja028196l

data_4113379
_publ_section_title
;
 Conformation-Activity Relationships in Polyketide Natural Products: A New
 Perspective on the Rational Design of Epothilone Analogues
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              26
_journal_page_last               27
_journal_paper_doi               10.1021/ja028196l
_journal_volume                  125
_journal_year                    2003
_chemical_formula_sum            'C28 H43 N O6 S'
_chemical_formula_weight         521.69
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   'geom, except difmap for hydroxyl H'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.8450(5)
_cell_length_b                   11.5335(6)
_cell_length_c                   25.0299(13)
_cell_measurement_reflns_used    9684
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.29
_cell_measurement_theta_min      2.63
_cell_volume                     2842.1(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0385
_diffrn_reflns_av_sigmaI/netI    0.0325
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            31366
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.94
_exptl_absorpt_coefficient_mu    0.154
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9409
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.219
_exptl_crystal_description       rectangular
_exptl_crystal_F_000             1128
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.467
_refine_diff_density_min         -0.370
_refine_diff_density_rms         0.065
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.03(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         7057
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0465
_refine_ls_R_factor_gt           0.0442
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0842P)^2^+0.3192P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1186
_refine_ls_wR_factor_ref         0.1211
_reflns_number_gt                6676
_reflns_number_total             7057
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja028196l-2_s2_1.cif
_cod_data_source_block           compound3
_cod_database_code               4113379