Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of proteolysis-targeting chimeras (PROTACs). Its structure allows for the attachment of E3 ligase ligands, enabling targeted protein degradation. Commonly employed in medicinal chemistry for constructing bifunctional molecules due to the presence of both a protected amine and a phthalimide group, which can be selectively deprotected and coupled. Valuable in research settings for creating novel drug candidates with improved selectivity and efficacy.