Ald-Ph-PEG-O-NH-Boc is a compound used in pharmaceutical research and development. It belongs to the class of polyethylene glycol (PEG) conjugates, which are widely used in drug delivery systems due to their unique physicochemical properties. The functional groups present in Ald-Ph-PEG-O-NH-Boc include an aldehyde group, a Boc-protected amine group, and a PEG moiety. The aldehyde group allows for easy modification of the compound through chemical reactions with other functional groups. The Boc-protected amine group makes the compound more stable and less reactive, which is important for drug development. The PEG moiety provides the compound with water solubility and biocompatibility, which are essential for pharmaceutical applications.