Acta Cryst. (2004). E60, o1671-o1673  [ doi:10.1107/S1600536804021403 ]

7a,8,9,10-Tetrahydrobenzo[f]cyclopenta[b]chromen-10-one

F. Huo, C. Yin and P. Yang

Online 4 September 2004

Key indicators

• Single-crystal X-ray study
• T = 298 K
• Mean (C-C) = 0.003 Å
• R factor = 0.037
• wR factor = 0.098
• Data-to-parameter ratio = 10.3

checkCIF/PLATON results

No syntax errors found



Alert level A
PLAT027_ALERT_3_A _diffrn_reflns_theta_full (too) Low ............      23.26 Deg.  

Alert level B
THETM01_ALERT_3_B  The value of sine(theta_max)/wavelength is less than 0.575
            Calculated sin(theta_max)/wavelength =    0.5556
PLAT023_ALERT_3_B Resolution (too) Low [sin(th)/Lambda < 0.6].....      23.26 Deg.  

Alert level C
PLAT066_ALERT_1_C Predicted and Reported Transmissions Identical .          ?
PLAT480_ALERT_4_C Long H...A H-Bond Reported H4A    ..  CG      ..       3.03 Ang.  
PLAT480_ALERT_4_C Long H...A H-Bond Reported H10    ..  CG      ..       2.95 Ang.  
PLAT481_ALERT_4_C Long D...A H-Bond Reported C4     ..  CG      ..       3.92 Ang.  

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

   1 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
   3 ALERT type 4 Improvement, methodology, query or suggestion

Copyright © International Union of Crystallography
IUCr Webmaster