Hydroxy-PEG3-ethyl acetate is widely used as a versatile intermediate in the synthesis of more complex molecules, particularly in the pharmaceutical and biotechnology industries. Its PEG (polyethylene glycol) spacer enhances solubility and stability, making it valuable for modifying drugs, peptides, and proteins to improve their pharmacokinetic properties. It is also utilized in the development of prodrugs, where it acts as a linker to control the release of active pharmaceutical ingredients. Additionally, this compound finds applications in bioconjugation techniques, enabling the attachment of functional groups to biomolecules for targeted drug delivery or diagnostic purposes. Its use in creating hydrogels and other biocompatible materials further highlights its importance in biomedical research and development.