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The properties of 4-(benzyloxy)benzaldehyde (BBA), as a pharmaceutically important compound, have been investigated through the density functional theory (DFT) calculations. The properties of original crystalline and optimised gaseous structures have been evaluated to recognise the crystalline effects. In addition to the structural properties, nuclear magnetic resonance (NMR) properties have also been evaluated for both investigated systems to better detect the effects in atomic levels. The results indicated that the structural shape of BBA is significantly changed in the optimised gaseous system, showing significant crystalline effects on the geometrical positions. Moreover, the magnitudes for energies and dipole moments indicate notable effects on the electronic properties. The evaluated NMR properties also show that the atoms of aromatic systems detect significant changes more than the atoms of aliphatic systems in the investigated BBA. And finally, the oxygen bridge atom plays a dominant role in combining two benzene rings of BBA. [ABSTRACT FROM AUTHOR]