Used in research and development, particularly in the study of cancer treatment mechanisms. It serves as a deuterated analog in pharmacokinetic and metabolic studies to track and analyze the behavior of its parent compound, AEE 788, which is a kinase inhibitor. This helps in understanding drug efficacy, metabolism, and potential side effects. It is also utilized in mass spectrometry-based assays to improve sensitivity and accuracy in detecting compounds in biological samples. Its application is crucial in advancing targeted therapies for diseases like cancer.