(2S,3R)-2-Phenylpyrrolidine-3-carboxylic acid is a chiral, non-natural amino acid derivative featuring a cis-substituted pyrrolidine ring. This compound is characterized by its specific stereochemistry at the 2- and 3-positions, making it a valuable chiral building block in organic synthesis. Its primary application is in pharmaceutical research and development as a key intermediate. The pyrrolidine scaffold is a privileged structure in medicinal chemistry, and this specific cis-configured derivative has been utilized in the synthesis of various bioactive molecules. It serves as a crucial precursor for the preparation of more complex heterocyclic compounds and peptidomimetics, particularly those targeting the central nervous system or acting as enzyme inhibitors. The compound is commercially available from suppliers specializing in fine chemicals and chiral intermediates for drug discovery. Its synthesis and use are of interest due to the growing demand for enantiomerically pure compounds in the development of new therapeutic agents.