Boc-NH-PEGn-alcohol is a series of PEG-based linkers that can be used in the synthesis of PROTACs. They contain a Boc-protected amine and a terminal hydroxyl group. The Boc group can be deprotected under mild acidic conditions to form the free amine which can be used for further conjugations. The hydroxyl group enables further derivatization or replacement with other reactive functional groups. This group of PEG linkers can be used as the building block for peptide synthesis due to its unique structure and properties, which allow for a variety of reactions and applications, including drug delivery, tissue engineering, and imaging.