Acta Cryst. (2003). E59, o1095-o1097  [ doi:10.1107/S1600536803014557 ]

(1R*,5S*,6S*,7R*)-6,7-Dihydroxy-6-hydroxymethyl-2-oxabicyclo[3.2.0]heptan-3-one

J. Caddy, D. B. G. Williams, A. Roodt and A. Muller

Key indicators

• Single-crystal X-ray study
• T = 293 K
• Mean (C-C) = 0.003 Å
• R factor = 0.030
• wR factor = 0.072
• Data-to-parameter ratio = 8.7

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry


 Alert Level C:



STRVAL_01                                                                       
         From the CIF: _refine_ls_abs_structure_Flack  -10.000                  
         From the CIF: _refine_ls_abs_structure_Flack_su   10.000               
           Alert C Flack parameter is too small                                 

General Notes



REFLT_03                                                                        
         From the CIF: _diffrn_reflns_theta_max           28.30                 
         From the CIF: _reflns_number_total               1107                  
         Count of symmetry unique reflns         1105                           
         Completeness (_total/calc)            100.18%                          
         TEST3: Check Friedels for noncentro structure                          
         Estimate of Friedel pairs measured         2                           
         Fraction of Friedel pairs measured     0.002                           
         Are heavy atom types Z>Si present           no                         
          Please check that the estimate of the number of Friedel pairs is      
          correct. If it is not, please give the correct count in the           
          _publ_section_exptl_refinement section of the submitted CIF.          


 0 Alert Level A = Potentially serious problem

 0 Alert Level B = Potential problem

 1 Alert Level C = Please check

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