Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and chromatography for the accurate quantification of triclocarban in environmental, biological, and pharmaceutical samples. Its deuterated structure allows it to be distinguished from non-labeled triclocarban during detection, improving measurement precision and reliability. Commonly applied in studies monitoring triclocarban residues in wastewater, soil, and human tissues due to its persistence and potential endocrine-disrupting effects. Also used in metabolic and pharmacokinetic research to trace the fate of triclocarban without interference from endogenous compounds.