The isomeric compounds nimbolide and isonimbolide
Solomon, K. Anand; Malathi, R.; Rajan, S. S.; Anitha, G.; Raj, J. Josepha Lourdu; Narasimhan, S.; Suresh, G.; Gopalakrishnan, Geetha; Acta Crystallographica Section C 61 (2005) o70–o72; doi:10.1107/S0108270104031385

data_2014642
_publ_section_title
;
 The isomeric compounds nimbolide and isonimbolide
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o70
_journal_page_last               o72
_journal_paper_doi               10.1107/S0108270104031385
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C27 H30 O7'
_chemical_formula_moiety         'C27 H30 O7'
_chemical_formula_sum            'C27 H30 O7'
_chemical_formula_weight         466.51
_chemical_name_common            Nimbolide
_chemical_name_systematic
;
(4\a,5\a,6\a,7\a,15\b,17\a)-7,15:21,23-diepoxy-6
-hydroxy-4,8-dimethyl-1-oxo-18,24-dinor-11,12-secochola-2,13,20,22-tetraene-
4,11-dicarboxylic acid \g-lactone methyl ester
;
_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
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.115(3)
_cell_length_b                   12.225(4)
_cell_length_c                   15.710(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      30
_cell_measurement_theta_min      15
_cell_volume                     2326.7(11)
_computing_cell_refinement       'CAD-4 EXPRESS'
_computing_data_collection       'CAD-4 EXPRESS (Enraf--Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'ORTEPIII (Burnett & Johnson, 1996)'
_computing_publication_material  'SHELXL97 and PARST97 (Nardelli, 1995)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  ' Enraf-Nonius CAD-4'
_diffrn_measurement_method       'non-profiled \w/2\q'
_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  0.1188
_diffrn_reflns_av_sigmaI/netI    0.0314
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2806
_diffrn_reflns_theta_full        75.23
_diffrn_reflns_theta_max         75.23
_diffrn_reflns_theta_min         4.58
_diffrn_standards_decay_%        4
_diffrn_standards_interval_count 200
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.786
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.332
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.410
_refine_diff_density_min         -0.285
_refine_ls_extinction_coef       0.0029(6)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 1997)'
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     355
_refine_ls_number_reflns         2695
_refine_ls_number_restraints     108
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.0841
_refine_ls_R_factor_gt           0.0585
_refine_ls_shift/su_max          0.015
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.1148P)^2^+0.6918P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1620
_refine_ls_wR_factor_ref         0.1832
_reflns_number_gt                1958
_reflns_number_total             2695
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fa1106.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_cell_volume        2326.8(10)
_cod_database_code               2014642
_cod_database_fobs_code          2014642