Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of targeted drug delivery systems. Its carboxylic acid and chloroalkyl functional groups enable conjugation with active pharmaceutical ingredients, facilitating controlled release and improved bioavailability. Commonly employed in the preparation of prodrugs and bioconjugates due to its biocompatible PEG-like linker properties. Also utilized in research settings for modifying peptides and proteins, enhancing their stability and membrane permeability.