Used as a deuterated internal standard in analytical chemistry, particularly in mass spectrometry and NMR spectroscopy, for accurate quantification and identification of non-deuterated analogs in complex mixtures. It aids in studying metabolic pathways and pharmacokinetics in pharmaceutical research. Also employed in organic synthesis to introduce deuterium labels into molecules for mechanistic studies or to enhance stability in certain compounds. Its application extends to environmental analysis for tracking and quantifying organic pollutants in trace amounts.