(R)-3-Amino-3-(o-tolyl)propanoic acid is a chiral non-natural amino acid derivative featuring a 2-methylphenyl (o-tolyl) substituent at the β-position of the alanine backbone. It is a white to off-white solid with a molecular formula of C10H13NO2. The compound is characterized by its (R)-configuration at the stereogenic center bearing the amino group, making it a valuable chiral building block. This compound is primarily utilized as a key chiral intermediate in pharmaceutical research and development. Its structure, containing both an amino group and a carboxylic acid, allows for versatile incorporation into peptide mimetics or as a core scaffold for designing novel bioactive molecules. The ortho-methylphenyl group provides steric and electronic modulation, which can be crucial for target binding and metabolic stability in drug candidates. It is specifically cited in patent literature related to the synthesis of pharmaceutical agents. As a β-amino acid derivative, it serves as a specialized synthon in organic synthesis, particularly for constructing compounds with specific stereochemistry and aromatic functionality. Standard safety precautions for handling amino acids and fine chemicals should be observed.