Used as a key intermediate in the synthesis of thienopyrimidine-based pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer therapy. Its structure allows for selective modification, making it valuable in medicinal chemistry for optimizing drug potency and bioavailability. Commonly employed in research settings to design analogs targeting epidermal growth factor receptor (EGFR) and other tyrosine kinases involved in tumor progression. Also utilized in the preparation of biologically active molecules with antiviral and anti-inflammatory properties.