Ald-benzyl-PEG-CH2 tBu-ester is a chemical compound that belongs to the family of polyethylene glycol (PEG) derivatives. PEG derivatives have gained significant attention in the field of pharmaceutical research and development due to their unique properties, including biocompatibility, water solubility, and low toxicity. Ald-benzyl-PEG-CH2 tBu-ester is a versatile molecule that can be used for various applications in the pharmaceutical industry, such as drug delivery, protein modification, and tissue engineering. The tBu-ester moiety provides stability to the compound, allowing it to be used in a variety of biological systems. The benzyl group can be easily functionalized to introduce different functional groups, which can further expand the applications of this compound.