[Open access]

[Contents scheme]

Acta Cryst. (2012). E68, o3233-o3234
[ doi:10.1107/S1600536812043619 ]

1,3-Dicyclohexylimidazolidine-2,4,5-trione: a second polymorph

O. Talhi, J. A. Fernandes, D. C. G. A. Pinto, A. M. S. Silva and F. A. Almeida Paz

Key indicators

checkCIF/PLATON results

No syntax errors found

Alert level C PLAT369_ALERT_2_C Long C(sp2)-C(sp2) Bond C2 - C3 ... 1.54 Ang.
Author Response: This bond connects two carbon atoms belonging to vicinal carbonyl groups. This feature is, in fact, a notable exception for which 1.54 Ang is indeed the typical mean value for corresponding C-C distance.
PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) .....          6      
Author Response: The data completeness is 99.8% which guarantees a correct structural elucidation of the crystal structure of the title compound.

Alert level G PLAT005_ALERT_5_G No _iucr_refine_instructions_details in CIF .... ? PLAT128_ALERT_4_G Alternate Setting of Space-group P21/c ....... P21/n
0 ALERT level A = Most likely a serious problem - resolve or explain 0 ALERT level B = A potentially serious problem, consider carefully 2 ALERT level C = Check. Ensure it is not caused by an omission or oversight 2 ALERT level G = General information/check it is not something unexpected 0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 1 ALERT type 2 Indicator that the structure model may be wrong or deficient 1 ALERT type 3 Indicator that the structure quality may be low 1 ALERT type 4 Improvement, methodology, query or suggestion 1 ALERT type 5 Informative message, check

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