Used as a deuterated internal standard in mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy for accurate quantification and structural analysis. Its deuterated labels enhance detection sensitivity and reduce background interference in complex mixtures. Commonly applied in environmental analysis, metabolic studies, and pharmaceutical research where precise tracking of naphthalene derivatives is required. Also serves as a solvent or reference compound in isotopic labeling experiments due to its stability and distinct mass signature.