Used in pharmaceutical research as a key intermediate in the synthesis of tyrosine kinase inhibitors, particularly targeting EGFR (epidermal growth factor receptor) for cancer therapy. Its structure allows selective modification to enhance binding affinity and improve metabolic stability in drug candidates. Commonly employed in the development of anticancer agents due to its ability to support potent inhibition of tumor cell proliferation. Also utilized in structure-activity relationship (SAR) studies to optimize quinazoline-based therapeutics.