checkCIF procedure

PLAT417

 Short non-bonding inter D-H..H-D contacts may be related to disordered or  
 misplaced H-atoms. 
 Experience has shown that any intermolecular H...H separation of less than 
 1.8 Angstroms between unit-occupancy H atoms is a clear indicator that one 
 or both of these H atoms may be wrongly placed.