Used as a key intermediate in the synthesis of functionalized polymers and PEGylated compounds. Its iodo terminus allows for further coupling reactions, such as in click chemistry or nucleophilic substitutions, while the PEG-like chain provides water solubility and biocompatibility. Commonly employed in bioconjugation to attach payloads like drugs, probes, or nanoparticles to targeting molecules. Also utilized in surface modification of nanoparticles and biosensors due to its ability to anchor via the iodine group and present a reactive ester for subsequent functionalization.