This compound is primarily utilized in the field of bioconjugation and chemical biology, where it serves as a linker for attaching various functional groups or molecules to proteins, peptides, or other biomolecules. Its structure, featuring multiple ethylene oxide units and a terminal carboxylic acid group, makes it highly water-soluble and biocompatible, ideal for creating stable conjugates. It is often employed in the development of drug delivery systems, such as antibody-drug conjugates (ADCs), where it helps connect therapeutic agents to targeting antibodies. Additionally, it is used in the synthesis of hydrogels and polymers for biomedical applications, including tissue engineering and controlled drug release. Its ability to form amide bonds also makes it valuable in peptide synthesis and modification.