Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in the preparation of bioactive quinazoline derivatives that exhibit antitumor, antiviral, and anti-inflammatory properties. Its structure allows for selective substitution at multiple sites, enabling fine-tuning of biological activity. Commonly employed in medicinal chemistry research for optimizing drug candidates targeting EGFR and other tyrosine kinases. Also utilized in the preparation of fluorescent probes due to its favorable photophysical characteristics.