Benzyl-PEG-Ms is a class of compounds that contain a benzyl group, a polyethylene glycol (PEG) chain, and a mesylate (Ms) functional group. The mesylate functional group is commonly used as a leaving group in organic chemistry reactions, making Benzyl-PEG-Ms a useful intermediate in the synthesis of a wide variety of pharmaceuticals. The PEG chain provides water solubility and biocompatibility, making it an attractive component in drug development. Benzyl-PEG-Ms is often used in the conjugation of drugs to biomolecules such as antibodies, peptides, and proteins, improving their pharmacokinetic properties and targeting ability. Additionally, Benzyl-PEG-Ms can be utilized in the development of drug delivery systems, such as liposomes and polymeric nanoparticles, allowing for improved drug stability and controlled release.