Used in pharmaceutical research as a deuterated analog to study metabolic pathways and drug interactions. Its incorporation of deuterium allows for tracing and analysis of biological processes, aiding in the development of more stable and effective drug compounds. Commonly applied in pharmacokinetic studies to understand how drugs are absorbed, distributed, metabolized, and excreted in the body. Also serves as a reference standard in mass spectrometry for accurate quantification and identification of related compounds in complex biological samples.