Pressure volume relations and optical Raman and In spectra of polycrystalline 1MNT have been obtained under quasi-hydrostatic conditions up to 16 and 40 GPa. respectively. by using diamond anvil cell. synchrotron-based angle-resolved X-ray diffraction, and microspectroscopy The X-ray measurements show that the pressure volume relations remain smooth up to 16 GPa at room temperature. while vibrational measurements show no evidence of a phase transition to near 40 GPa Anomalous increases of several vibrational intensities and bandwidths suggest that subtle molecular distortions and structural modifications occur in the crystal as pressure increases Decompression experiments indicate the structural modifications are reversible