Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of kinase inhibitors and anticancer drugs. Its structure allows for selective modification, making it valuable in medicinal chemistry for designing compounds with enhanced biological activity. Commonly employed in research settings to develop potential treatments for tumors and inflammatory diseases due to its ability to interact with specific enzyme targets. Also utilized in the preparation of fluorescent probes for biochemical assays, leveraging its quinazoline core for optical properties.