Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other bioactive molecules targeting cancer and inflammatory diseases. Its structure enables functionalization at multiple sites, making it valuable in medicinal chemistry for building complex heterocyclic systems. Commonly employed in research settings to design potent and selective drug candidates, especially those involving pyrido-pyrimidine scaffolds known for their biological activity. Also utilized in the preparation of fluorescent probes due to inherent photophysical properties.