Low-odor thiol-ester combining –SH and –COOCH₃ functions; widely used as a chain-transfer agent in radical polymerisation, building block for high-refractive-index epoxy/PU optical materials, and intermediate for thio-lactones and pharmaceutical actives. Soluble in most organic solvents, insoluble in water. Store tightly closed under nitrogen, 2–8 °C, away from oxidants
