Mesogen molecules have been considered as rigid objects. However, recent deuteron magnetic resonance experiments (DMR) have shown that the end chains of those molecules can undergo deformations through oscillations or isomeric rotations around the C—C. bonds. We discuss here the occurrence of similar deformations in the complex aromatic core of TBBA which has three phenyl groups. At the moment DMR fails providing a direct proof of such intramolecular motions but their existence cannot be eliminated owing to the weak value calculated for the rotational energy barrier around the para axis of the central phenyl group