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Alert level A
PLAT413_ALERT_2_A Short Inter XH3 .. XHn     H10B   ..  H11A    ..       1.87 Ang.  
PLAT413_ALERT_2_A Short Inter XH3 .. XHn     H10C   ..  H11B    ..       1.85 Ang

PLAT413

PLAT413 Type_2 Test for short non-bonding inter H..H contacts (involving XH3)
Short intermolecular H..H contacts may indicate incorrectly determined
structures (i.e. wrong symmetry, missed translation symmetry, wrong position
with reference to the symmetry elements, hydrogen atoms on atoms where there
should not be any  etc..). Short intermolecular contacts may be indicative
for inconsistent symmetry data (e.g. coordinates for space-group P43 and
symmetry specified as P41 or P21/n & P21/c confusions). Short contacts are
defined using a van der Waals radius of 1.2 Angstrom. Short H .. H contact
involving CH3 H-atoms are often hampered by the fact that they involve
H atoms at not optimal calculated positions.
Copyright © International Union of Crystallography
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