S-Acetyl-peg2-t-butyl ester is widely used in the field of organic synthesis and pharmaceutical research. It serves as a key intermediate in the preparation of complex molecules, particularly in the development of prodrugs and drug delivery systems. Its acetyl and t-butyl ester groups provide protective functionalities, enabling controlled reactions and stability during synthesis. This compound is also utilized in the modification of peptides and proteins, enhancing their solubility and bioavailability. Additionally, it plays a role in the creation of polyethylene glycol (PEG) derivatives, which are essential in improving the pharmacokinetic properties of therapeutic agents. Its versatility makes it valuable in designing targeted therapies and optimizing drug formulations.