Used as a labeled compound in analytical chemistry, particularly in mass spectrometry and nuclear magnetic resonance (NMR) studies, to track and identify metabolites or reaction pathways. It serves as an internal standard in quantitative analysis, ensuring accurate measurements in complex mixtures. Applied in pharmaceutical research for drug development, where it helps in understanding drug metabolism and pharmacokinetics. Also utilized in environmental studies to trace organic pollutants and their degradation products. Its deuterated form enhances precision in detecting and analyzing chemical processes.