The solid-state behaviour of 4,6-dioxo-5,5-diethylenepyrimidine-2-isobutylurea
Spencer, Elinor C.; Howard, Judith A. K.; Baruah, Pranjal K.; Sanjayan, Gangadhar J.; CrystEngComm 8 (2006) 468–; doi:10.1039/b603252d

data_7203370
_publ_section_title
;
 The solid-state behaviour of
 4,6-dioxo-5,5-diethylenepyrimidine-2-isobutylurea
;
_journal_issue                   6
_journal_name_full               CrystEngComm
_journal_page_first              468
_journal_paper_doi               10.1039/b603252d
_journal_volume                  8
_journal_year                    2006
_chemical_formula_moiety         'C15 H21 N4 O3, (C15 H22 N4 O3)2'
_chemical_formula_sum            'C15 H21.67 N4 O3'
_chemical_formula_weight         306.03
_chemical_name_common
4,6-Dioxo-5,5-diethylenepyrimidine-2-isobutylurea
_chemical_name_systematic
;
4,6-Dioxo-5,5-diethylenepyrimidine-2-isobutylurea
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                73.608(2)
_cell_angle_beta                 71.557(2)
_cell_angle_gamma                66.840(2)
_cell_formula_units_Z            6
_cell_length_a                   12.0670(6)
_cell_length_b                   13.8660(7)
_cell_length_c                   17.6218(9)
_cell_measurement_reflns_used    3394
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      22.609
_cell_measurement_theta_min      2.214
_cell_volume                     2529.2(2)
_computing_cell_refinement       'Bruker SMART 1998'
_computing_data_collection       'Bruker SMART 1998'
_computing_data_reduction        'Bruker SAINT 1998'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      180(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker SMART CCD 1K area detector'
_diffrn_measurement_method       \w
_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  0.0778
_diffrn_reflns_av_sigmaI/netI    0.1205
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            22398
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.62
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.891717
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS (Sheldrick, G. M. (1998)).
Program for Absorption Correction.
University of G\"ottingen, Germany.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.206
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       Block
_exptl_crystal_F_000             982
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.453
_refine_diff_density_min         -0.287
_refine_diff_density_rms         0.048
_refine_ls_extinction_coef       'not refined'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.946
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     642
_refine_ls_number_reflns         8896
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.946
_refine_ls_R_factor_all          0.1709
_refine_ls_R_factor_gt           0.0669
_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^)+(0.0832P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1472
_refine_ls_wR_factor_ref         0.1811
_reflns_number_gt                4049
_reflns_number_total             8896
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b603252d.txt
_cod_data_source_block           gamma_form
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/adriana/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 1555 2011-01-17 13:19:09Z saulius 
;
_cod_original_sg_symbol_Hall     '-p 1'
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7203370