The compound with CAS 96293-19-5 is a chiral amino acid derivative, specifically (S)-O-(N-Benzylprolyl)amino(phenyl)acetonitrile. Its structure features a proline core modified with a benzyl group and linked to a phenylacetonitrile moiety via an O-alkylamino bridge. This specific scaffold is a key intermediate in the synthesis of more complex molecules. Its primary and most significant application is in the field of targeted protein degradation (TPD), particularly in the development of Proteolysis-Targeting Chimeras (PROTACs). This compound serves as a versatile **linker** component. The proline-based structure provides a rigid, chiral backbone that can effectively connect an E3 ligase ligand (often based on a VHL or CRBN binder) to a target protein ligand, influencing the overall geometry and pharmacokinetic properties of the final PROTAC degrader. Due to its defined chiral center and functional groups (amine, nitrile), it also functions as a specialized **organic synthetic building block** for constructing peptide mimetics and other pharmacologically active scaffolds beyond PROTACs. Its synthesis and use require handling under inert conditions due to potential sensitivity.