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PLAT340_ALERT_3_C Low Bond Precision on  C-C Bonds (x 1000) Ang ..          5      
PLAT432_ALERT_2_C Short Inter X...Y Contact  O1     ..  C2      ..       2.96 Ang.
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Alert level C
PLAT340_ALERT_3_C Low Bond Precision on  C-C Bonds (x 1000) Ang ..          5      
PLAT432_ALERT_2_C Short Inter X...Y Contact  O1     ..  C2      ..       2.96 Ang.
PLAT432_ALERT_2_C Short Inter X...Y Contact  O1     ..  C3      ..       3.01 Ang.

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There are several problems with the structure reported in this paper:
- unusual short intermolecular contacts (e.g. O1 C2[3/2-x,1/2+y,1/2-z], -0.26 Angstrom shorter then the sum of the Van der Waalsradii)
- large discrepencies between F(obs) and F(calc) (e.g. -6 2 3)
- some reflections are missing (e.g. -4 0 2, which was expected to be strong)
- unsual positions of residual density
- unstable positions of some of the H-atoms in free refinement
All these issues suggest a serious problem like twinning, disorder or an incorrect space group assignment.
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hzq6805(½ð±Ò+1,VIP+0): 11-18 16:47
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