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Species with point groups that differ from experiment at ROMP2/6-31G(2df,p)

  Point group
Species Name Experimental Calculated
CH3CHO+ acetaldehyde cation Cs C1
KCN Potassium cyanide C∞v Cs
SO3- Sulfur trioxide anion D3h C3v
CHCl2CHO dichloroacetaldehyde C1 Cs