Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry due to its ability to undergo selective substitutions on the quinazoline ring, enabling the creation of targeted therapies for EGFR (epidermal growth factor receptor) and other tyrosine kinase-related diseases. Its structural features allow for improved binding affinity and selectivity in drug candidates. Also employed in research settings for designing novel bioactive molecules with potential antitumor, anti-inflammatory, or antimicrobial properties.