Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in the preparation of active pharmaceutical ingredients (APIs) targeting epidermal growth factor receptor (EGFR) and other tyrosine kinases. Its structure allows for selective modification, enabling optimization of drug potency and selectivity. Also employed in research for antimalarial and anti-inflammatory agents due to its quinazoline core, which exhibits diverse biological activity. Commonly utilized in medicinal chemistry for structure-activity relationship (SAR) studies.