(IUCr) Crystallography Journals Online checkcif report

[Contents scheme]

Acta Cryst. (2006). E62, o977-o979 [ doi:10.1107/S1600536806004211 ]

2,5-Di-O-acetyl-3-C-methyl-D-lyxono-1,4-lactone

R. Bream, D. Watkin, R. Soengas, V. Eastwick-Field and G. W. J. Fleet

Online 8 February 2006

Key indicators

Single-crystal X-ray study
T = 150 K
Mean (C-C) = 0.002 Å
R factor = 0.034
wR factor = 0.073
Data-to-parameter ratio = 10.0

checkCIF/PLATON results

No syntax errors found




Alert level C
ABSTM02_ALERT_3_C  The ratio of expected to reported Tmax/Tmin(RR') is < 0.90
            Tmin and Tmax reported:      0.869     0.990
            Tmin(prime) and Tmax expected:      0.976     0.990
            RR(prime) =      0.891
            Please check that your absorption correction is appropriate.
PLAT061_ALERT_3_C Tmax/Tmin Range Test RR' too Large .............       0.89       
PLAT125_ALERT_4_C No _symmetry_space_group_name_Hall Given .......          ?

Alert level G
REFLT03_ALERT_4_G 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.
           From the CIF: _diffrn_reflns_theta_max           27.49
           From the CIF: _reflns_number_total               1545
           Count of symmetry unique reflns         1563
           Completeness (_total/calc)             98.85%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured         0
           Fraction of Friedel pairs measured     0.000
           Are heavy atom types Z>Si present         no

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

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