The Iromycins, a New Family of Pyridone Metabolites from Streptomyces sp. I. Structure, NOS Inhibitory Activity, and Biosynthesis
Frank Surup; Oliver Wagner; Jan von Frieling; Michael Schleicher; Stefanie Oess; Peter Müller; Stephanie Grond; Journal of Organic Chemistry 72 (2007) 5085–5090; doi:10.1021/jo0703303

data_4023972
_publ_section_title
;
 The Iromycins, a New Family of Pyridone Metabolites from
 Streptomyces sp. I. Structure, NOS Inhibitory Activity,
 and Biosynthesis
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              5085
_journal_page_last               5090
_journal_paper_doi               10.1021/jo0703303
_journal_volume                  72
_journal_year                    2007
_chemical_formula_sum            'C20 H32 N O3.5'
_chemical_formula_weight         342.47
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           82
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'I -4'
_symmetry_space_group_name_H-M   'I -4'
_atom_sites_solution_hydrogens   geom
_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            8
_cell_length_a                   13.7063(19)
_cell_length_b                   13.7063(19)
_cell_length_c                   22.371(5)
_cell_measurement_reflns_used    8192
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      23.0
_cell_measurement_theta_min      2.8
_cell_volume                     4202.6(12)
_computing_cell_refinement       'Siemens SAINT (V. 5.00, Siemens 1998)'
_computing_data_collection       'Siemens SMART (V. 4.202, Siemens 1996)'
_computing_data_reduction        'Siemens SAINT (V. 5.00, Siemens 1998)'
_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      133(2)
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type
'Stoe-Siemens-Huber four circle diffractometer'
_diffrn_measurement_method       'omega and phi 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  0.0647
_diffrn_reflns_av_sigmaI/netI    0.0172
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            24444
_diffrn_reflns_theta_full        23.24
_diffrn_reflns_theta_max         23.24
_diffrn_reflns_theta_min         2.78
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9927
_exptl_absorpt_correction_T_min  0.9644
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2005)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.083
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             1496
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.483
_refine_diff_density_min         -0.265
_refine_diff_density_rms         0.061
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.118
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         1554
_refine_ls_number_restraints     205
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0685
_refine_ls_R_factor_gt           0.0628
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1288P)^2^+2.5435P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1752
_refine_ls_wR_factor_ref         0.1812
_reflns_number_gt                1414
_reflns_number_total             1554
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo0703303si20070216_044415.cif
_cod_data_source_block           tapir
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_formula_sum        'C20 H32 N O3.50'
_cod_database_code               4023972