LCL-PEG3-N3 (hydrochloride) serves as a bait oligonucleotide E3 ligase ligand, useful for developing chimeric molecules like LCL-ER(dec) to degrade estrogen receptors. As a click chemistry reagent featuring an Azide group, it can undergo copper-catalyzed azide-alkyne cycloaddition reactions (CuAAC) with alkyne-containing molecules. Additionally, it can participate in strain-promoted azide-alkyne cycloaddition reactions (SPAAC) with molecules containing DBCO or BCN groups.