Antineoplastic agents. 590. X-ray crystal structure of dolastatin 16 and syntheses of the dolamethylleuine and dolaphenvaline units.
Pettit, George R.; Smith, Thomas H.; Xu, Jun-Ping; Herald, Delbert L.; Flahive, Erik J.; Anderson, Collin R.; Belcher, Paul E.; Knight, John C.; Journal of natural products 74 (2011) 1003–1008; doi:10.1021/np100877h

data_1501807
_publ_section_title
;
 Antineoplastic agents. 590. X-ray crystal structure of dolastatin 16 and
 syntheses of the dolamethylleuine and dolaphenvaline units.
;
_journal_issue                   5
_journal_name_full               'Journal of natural products'
_journal_page_first              1003
_journal_page_last               1008
_journal_paper_doi               10.1021/np100877h
_journal_volume                  74
_journal_year                    2011
_chemical_absolute_configuration
'AD-absolute structure could not be determined'
_chemical_formula_sum            'C15 H19 N O4'
_chemical_formula_weight         277.31
_chemical_name_common            Cbz-dolamethylleuine
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 99.722(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.2182(2)
_cell_length_b                   8.5374(3)
_cell_length_c                   12.1649(4)
_cell_measurement_reflns_used    1673
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      68.48
_cell_measurement_theta_min      6.22
_cell_volume                     738.89(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      123(2)
_diffrn_measured_fraction_theta_full 0.839
_diffrn_measured_fraction_theta_max 0.839
_diffrn_measurement_device_type  'Bruker CCD area detector'
_diffrn_measurement_method       'Phi and omega scans'
_diffrn_radiation_monochromator  Graphite
_diffrn_radiation_source         'Fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0585
_diffrn_reflns_av_sigmaI/netI    0.0686
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            4091
_diffrn_reflns_theta_full        69.67
_diffrn_reflns_theta_max         69.67
_diffrn_reflns_theta_min         6.22
_diffrn_standards_decay_%        -0.032
_exptl_absorpt_coefficient_mu    0.744
_exptl_absorpt_correction_T_max  0.957
_exptl_absorpt_correction_T_min  0.558
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS- Acta Cryst. A51 (1995)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.246
_exptl_crystal_density_meas      ?
_exptl_crystal_description       Needles
_exptl_crystal_F_000             296
_exptl_crystal_size_max          0.64
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.366
_refine_diff_density_min         -0.345
_refine_diff_density_rms         0.089
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   1.1(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.084
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           'Full-matrix least-squares on F^2'
_refine_ls_number_parameters     184
_refine_ls_number_reflns         1851
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.084
_refine_ls_R_factor_all          0.0877
_refine_ls_R_factor_gt           0.0597
_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^)+(0.1611P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1574
_refine_ls_wR_factor_ref         0.2262
_reflns_number_gt                1469
_reflns_number_total             1851
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np100877h_si_004.cif
_cod_data_source_block           p21
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_atom_sites_solution_hydrogens' value 'Geom' changed to
'geom' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_atom_sites_solution_primary' value 'Direct' changed to
'direct' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_atom_sites_solution_secondary' value 'Difmap' changed
to 'difmap' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Empirical'
changed to 'empirical' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_refine_ls_weighting_scheme' value 'Calc' changed to
'calc' 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_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'Not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               1501807