Used in pharmaceutical research as a key intermediate in the synthesis of kinase inhibitors, particularly targeting cancer-related proteins such as EGFR and VEGFR. Its structure supports enhanced binding affinity and selectivity due to the thiomorpholine and fluoroaryl groups. Commonly employed in the development of small-molecule therapeutics for solid tumors. Also utilized in structure-activity relationship (SAR) studies to optimize metabolic stability and oral bioavailability in drug candidates.