Used as a reversible addition-fragmentation chain-transfer (RAFT) agent in controlled radical polymerization. Enables precise control over molecular weight and polydispersity of synthesized polymers. Commonly applied in the preparation of block copolymers, graft polymers, and functional polymers for drug delivery systems, nanotechnology, and advanced materials. The N-hydroxysuccinimide ester group allows for efficient conjugation with amine-containing molecules or surfaces, making it valuable in bioconjugation and surface modification applications. Suitable for creating well-defined polymer architectures in both academic and industrial research settings.