This compound is widely used in organic synthesis, particularly in the field of drug development and bioconjugation. Its structure, featuring a benzyl group and a polyethylene glycol (PEG) spacer, makes it valuable for creating linkers in antibody-drug conjugates (ADCs). The PEG3 spacer enhances solubility and stability, while the methyl ester group allows for further functionalization through hydrolysis or transesterification reactions. It is also employed in the modification of peptides and proteins to improve their pharmacokinetic properties. Additionally, it serves as a building block in the synthesis of complex molecules for pharmaceutical and biochemical research.