Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry due to its ability to interact with biological targets through its quinazoline core and substituted aromatic rings. Commonly employed in research settings to design and optimize drug candidates targeting tyrosine kinases involved in tumor growth and inflammation. Also utilized in the preparation of fluorescent probes and labeled compounds for biochemical assays.