TAK-901-d3 is primarily used in research and development within the pharmaceutical industry. It serves as a deuterated analog of TAK-901, which is a selective inhibitor of the Aurora A kinase enzyme. The deuterium labeling in TAK-901-d3 allows for its use in metabolic studies and pharmacokinetic research, providing insights into the drug's behavior in biological systems. This compound is particularly valuable in tracer studies, where it helps track the distribution, metabolism, and excretion of the parent drug. Additionally, it aids in the identification and quantification of metabolites, contributing to the optimization of drug efficacy and safety profiles. Its application is crucial in advancing the understanding of Aurora A kinase inhibitors and their therapeutic potential in cancer treatment.