Conformational flexibility in solution often complicates the
analysis since all populated conformers have to be taken into account.
In this case solid state ECD could offer the possibility to
calculate only the conformer which is found in the crystal. From the
crystal structure obtained by x-ray, the ECD spectrum can be
calculated and compared with experiment to assign the AC. However,
as stated by Pescitelli [61], the influence of intermolecular
interactions can hardly be predicted.