Acta Cryst. (2008). E64, o1135  [ doi:10.1107/S1600536808014451 ]

2,7-Dihydroxy-3,6-dimethoxyphenanthrene from Dehaasia longipedicellata

M. R. Mukhtar, M. A. Nafiah, K. Awang, A. H. A. Hadi and S. W. Ng

Online 21 May 2008

Key indicators

• Single-crystal X-ray study
• T = 100 K
• Mean (C-C) = 0.002 Å
• R factor = 0.046
• wR factor = 0.150
• Data-to-parameter ratio = 12.6

checkCIF/PLATON results

No syntax errors found




Alert level C
PLAT222_ALERT_3_C Large Non-Solvent    H     Ueq(max)/Ueq(min) ...       4.00 Ratio
PLAT731_ALERT_1_C Bond    Calc     0.95(2), Rep    0.951(9) ......       2.22 su-Ra
              C8   -H8      1.555   1.555                                      
PLAT731_ALERT_1_C Bond    Calc   0.947(19), Rep    0.946(9) ......       2.11 su-Ra
              C13  -H13     1.555   1.555                                      

Alert level G
PLAT860_ALERT_3_G Note: Number of Least-Squares Restraints .......         14      

   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

   2 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
   0 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

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