Four Diterpene Isonitriles from the Sponge <i>Cymbastela hooperi</i>
Linden, A.; König, G. M.; Wright, A. D.; Acta Crystallographica Section C 52 (1996) 2601–2607; doi:10.1107/S010827019600515X

data_2005452
_publ_section_title
;
 Four Diterpene Isonitriles from the Sponge <i>Cymbastela hooperi</i>
;
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              2601
_journal_page_last               2607
_journal_paper_doi               10.1107/S010827019600515X
_journal_volume                  52
_journal_year                    1996
_chemical_formula_moiety         'C21 H31 N'
_chemical_formula_sum            'C21 H31 N'
_chemical_formula_weight         297.48
_chemical_melting_point          398.0(7)
_chemical_name_common
; (1S*,3S*,4R*,7S*,8S*,11R*,12R*,13S*,20S*)-7-
isocyanoisocycloamphilect-14-ene
;
_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_type_scat_source
;
International Tables for Crystallography (1992, Vol. C, Tables 4.2.6.8 and
6.1.1.4)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.319(2)
_cell_length_b                   17.591(4)
_cell_length_c                   7.145(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173(1)
_cell_measurement_theta_max      20.0
_cell_measurement_theta_min      17.5
_cell_volume                     1799.7(7)
_computing_cell_refinement       'MSC/AFC Diffractometer Control Software'
_computing_data_collection
;MSC/AFC Diffractometer Control Software (Molecular Structure Corporation,
 1991)
;
_computing_data_reduction
'TEXSAN PROCESS (Molecular Structure Corporation, 1989)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  'TEXSAN FINISH'
_computing_structure_refinement  'TEXSAN LS'
_computing_structure_solution    'SHELXS86 direct methods (Sheldrick, 1990)'
_diffrn_ambient_temperature      173.0(10)
_diffrn_measurement_device       'Rigaku AFC-5R'
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode generator'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.026
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            3607
_diffrn_reflns_theta_max         30
_diffrn_reflns_theta_min         2.5
_diffrn_standards_decay_%        'not significant'
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.0623
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.098
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.33
_refine_diff_density_max         0.26
_refine_diff_density_min         -0.21
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_obs   2.091
_refine_ls_hydrogen_treatment    refU
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     230
_refine_ls_number_reflns         2219
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.1233
_refine_ls_R_factor_obs          0.0564
_refine_ls_shift/esd_max         0.0002
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     'w = 1/[\s^2^(F~o~) + (0.005F~o~)^2^]'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0469
_refine_ls_wR_factor_obs         0.0431
_reflns_number_observed          2219
_reflns_number_total             3468
_reflns_observed_criterion       I>2\s(I)
_cod_data_source_file            ab1372.cif
_cod_data_source_block           II
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '397.3-398.6' was changed to
'398.0(7)' - the average value was taken and precision was estimated.

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 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'w = 1/[\s^2^(F~o~) +
(0.005F~o~)^2^]' was changed to 'calc'. New tag
'_refine_ls_weighting_details' was created. The value of the new tag
was set to 'w = 1/[\s^2^(F~o~) + (0.005F~o~)^2^]'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1799.8(6)
_cod_database_code               2005452