SAHA-d5 is primarily used in research and development, particularly in the field of biochemistry and pharmacology. It serves as a deuterated analog of SAHA (Suberoylanilide Hydroxamic Acid), which is a well-known histone deacetylase (HDAC) inhibitor. The deuterium atoms in SAHA-d5 make it a valuable tool in metabolic studies, as they help track and analyze the drug's behavior and breakdown pathways in biological systems. This compound is often employed in mass spectrometry-based assays to improve the accuracy of pharmacokinetic and pharmacodynamic studies. Additionally, SAHA-d5 is utilized in the development of new therapeutic agents targeting epigenetic regulation, aiding in the understanding of HDAC inhibition mechanisms and their potential applications in treating diseases like cancer.