Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. Its structure allows for selective binding to enzyme targets involved in cell signaling pathways. Commonly employed in research settings to design drugs targeting tyrosine kinases, which play roles in tumor growth and progression. Also utilized in medicinal chemistry for structure-activity relationship (SAR) studies to optimize potency and selectivity of quinazoline-based therapeutics.