Boc-C1-PEG3-C4-OH is an Alkyl/ether-based PROTAC linker utilized in the synthesis of PROTACs, which are characterized by their structure comprising two distinct ligands tethered by a linker. One ligand of PROTACs binds to an E3 ubiquitin ligase, while the other binds to the target protein. By leveraging the intracellular ubiquitin-proteasome system, PROTACs facilitate the targeted degradation of specific proteins[1].