Venetoclax N-oxide is primarily used in pharmaceutical research and development as a metabolite of Venetoclax, a drug widely employed in the treatment of certain types of cancer, particularly chronic lymphocytic leukemia (CLL) and acute myeloid leukemia (AML). As a metabolite, it plays a crucial role in understanding the pharmacokinetics and metabolic pathways of Venetoclax, helping researchers optimize drug efficacy and safety. Its study aids in identifying potential interactions, side effects, and mechanisms of action, contributing to the development of more effective therapeutic strategies. Additionally, it serves as a reference standard in analytical testing to ensure accurate measurement and monitoring of Venetoclax levels in patients, supporting personalized medicine approaches.