Form II has been studied by a multi-technique approach, 17 including; incoherent elastic and inelastic neutron scattering, DSC and X-ray diffraction over a range of temperatures from 2 to 300 K. A dynamic transition at 150 K was observed and ascribed to a crossover for harmonic to anharmonic motion. An anomaly was also seen at 240 K in the unit-cell parameters of the crystal. The pressure dependence of the Raman scattering of Forms I and II has been studied to get an understanding of the dynamics of the side chain on the phase transitions observed in this material. For Form II phase transitions were observed around 2.9 and 3.9 GPa which were completely reversible, indicating no radical change to the molecular conformation under pressure. Form I was observed to behave differently, indicating substantial conformational changes with pressure.