Used primarily as an intermediate in the synthesis of pharmaceutical compounds, especially in the development of kinase inhibitors and other biologically active molecules. Its organotin functionality allows it to participate in palladium-catalyzed cross-coupling reactions, such as Stille coupling, enabling the formation of carbon-carbon bonds in complex heterocyclic systems. This makes it valuable in medicinal chemistry for constructing drug candidates targeting cancer, inflammation, and central nervous system disorders. Due to the toxicity associated with tin residues, it is generally not present in final drug products but serves a critical role in early synthetic steps where selective functionalization of the pyridine ring is required.