Acta Cryst. (2004). E60, o878-o880  [ doi:10.1107/S1600536804009171 ]

1-Hydroxy-2,3,4,7-tetramethoxyxanthone from Swertia Chirayita

G.-F. Shi, R.-H. Lu, Y.-S. Yang, C.-L. Li, A.-M. Yang and L.-X. Cai

Online 30 April 2004

Key indicators

• Single-crystal X-ray study
• T = 293 K
• Mean (C-C) = 0.007 Å
• R factor = 0.052
• wR factor = 0.165
• Data-to-parameter ratio = 12.2

checkCIF/PLATON results

No syntax errors found




Alert level B
PLAT026_ALERT_3_B Ratio Observed / Unique Reflections too Low ....         35 Perc. 
PLAT027_ALERT_3_B _diffrn_reflns_theta_full (too) Low ............      24.98 Deg.  

Alert level C
PLAT031_ALERT_4_C Refined Extinction Parameter within Range ......       2.67 Sigma 
PLAT340_ALERT_3_C Low Bond Precision on C-C bonds (x 1000) Ang ...          7       

   0 ALERT level A = In general: serious problem
   2 ALERT level B = Potentially serious problem
   2 ALERT level C = Check and explain
   0 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
   3 ALERT type 3 Indicator that the structure quality may be low
   1 ALERT type 4 Improvement, methodology, query or suggestion

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