Acta Cryst. (2008). E64, o1021  [ doi:10.1107/S1600536808012452 ]

Bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride

T. Hu

Online 10 May 2008

Key indicators

• Single-crystal X-ray study
• T = 296 K
• Mean (C-C) = 0.003 Å
• R factor = 0.043
• wR factor = 0.100
• Data-to-parameter ratio = 12.9

checkCIF/PLATON results

No syntax errors found




Alert level C
SHFSU01_ALERT_2_C  Test not performed. _refine_ls_shift/su_max and
            _refine_ls_shift/esd_max not present.
            Absolute value of the parameter shift to su ratio given   0.001
PLAT432_ALERT_2_C Short Inter X...Y Contact  O4     ..  C10     ..       3.01 Ang. 

Alert level G
PLAT793_ALERT_4_G Check the Absolute Configuration of C2     .....          R      
PLAT793_ALERT_4_G Check the Absolute Configuration of C4     .....          S      
PLAT793_ALERT_4_G Check the Absolute Configuration of C7     .....          R      
PLAT793_ALERT_4_G Check the Absolute Configuration of C9     .....          S      

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   2 ALERT level C = Check and explain
   4 ALERT level G = General alerts; check

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   2 ALERT type 2 Indicator that the structure model may be wrong or deficient
   0 ALERT type 3 Indicator that the structure quality may be low
   4 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

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