(IUCr) Crystallography Journals Online checkcif report

[Contents scheme]

Acta Cryst. (2002). E58, o40-o41 [ doi:10.1107/S1600536801019699 ]

2,6-Dimethyl-3-nitro-8H-furo[2,3-g][1]benzopyran-8-one

I. Wolska and J. Kossakowski

Online 14 December 2001

Key indicators

Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.005 Å
R factor = 0.069
wR factor = 0.168
Data-to-parameter ratio = 8.5

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry


 Alert Level A:



THETM_01  Alert A The value of sine(theta_max)/wavelength is less than 0.550    
          Calculated sin(theta_max)/wavelength =    0.5384                      


 Alert Level C:



REFNR_01  Alert C Ratio of reflections to parameters is < 10 for a              
          centrosymmetric structure                                             
          sine(theta)/lambda                0.5384                              
          Proportion of unique data used    1.0000                              
          Ratio reflections to parameters   8.5058                              


 1 Alert Level A = Potentially serious problem

 0 Alert Level B = Potential problem

 1 Alert Level C = Please check