Used primarily as a deuterated internal standard in analytical chemistry, particularly in gas chromatography-mass spectrometry (GC-MS) for the quantification of non-deuterated 1,4-dichlorobenzene in environmental and biological samples. Its application ensures accurate measurement and traceability in studies involving the detection of pollutants or metabolites. Additionally, it serves as a reference compound in NMR spectroscopy for structural elucidation and chemical shift calibration in deuterated solvents.