Benzyl-PEG8-bromide (benzyl-octyloxyethylene glycol-bromide) has the molecular formula C₂₃H₃₉BrO₈ and a molecular weight of 523.46. Its structure consists of three parts: a benzyl group, an octyloxyethylene glycol chain, and a bromine atom. The benzyl group provides reactive sites, the octyloxyethylene glycol chain imparts good hydrophilicity and biocompatibility, and the bromine atom serves as an active group participating in chemical reactions. It is primarily produced using chemical synthesis methods, with precise synthesis achieved by controlling reaction conditions. This product is mainly used in the synthesis of PROTAC molecules, acting as a linker to connect E3 ubiquitin ligase ligands and target protein ligands. It is also utilized in fields such as biomedical research and materials science.