(S)-4-(2-Amino-2-carboxyethyl)benzoic acid is a non-proteinogenic amino acid derivative featuring a benzoic acid moiety linked to an L-α-amino acid core. It is structurally characterized as an L-tyrosine analog where the phenolic hydroxyl group is replaced by a hydrogen atom, making it a valuable synthetic building block. This compound serves as a key intermediate in the synthesis of various pharmaceutical agents. Its primary application is in the research and development of peptide-based drugs and enzyme inhibitors, where it can be incorporated to modulate the physicochemical properties, stability, or receptor binding affinity of the target molecule. The presence of both amino and carboxylic acid functional groups allows for versatile chemical modifications and peptide coupling reactions. As a chiral, non-natural amino acid derivative, it is also utilized in biochemical studies and as a precursor for designing novel bioactive compounds, particularly in areas targeting metabolic pathways or protein-protein interactions.