Used as a labeled internal standard in mass spectrometry and metabolic studies to track the behavior and transformation of compounds in biological systems. Its deuterated structure allows for clear differentiation from non-labeled analogs, improving accuracy in quantification. Commonly applied in pharmaceutical research for studying drug metabolism and pharmacokinetics, especially when analyzing compounds with similar structures. Also employed in organic synthesis as a building block for deuterated molecules, aiding in the development of stable isotopically labeled reference materials.