(2R)-2-Amino-2-(3-tert-butyl-1-bicyclo[1.1.1]pentanyl)acetic acid is a structurally unique non-natural amino acid derivative featuring a rigid bicyclo[1.1.1]pentane (BCP) core with a tert-butyl substituent at the 3-position. The BCP scaffold imparts high three-dimensional steric constraint and metabolic stability, while the chiral (R)-configuration at the α-carbon ensures enantioselective interactions in biological systems. The tert-butyl group enhances lipophilicity and may influence target binding affinity. This compound serves as a valuable building block in medicinal chemistry, particularly for designing peptidomimetics or constrained peptides to improve proteolytic resistance and conformational control. Its compact, sp3-rich structure makes it attractive for modulating physicochemical properties in drug discovery, offering potential applications in developing protease inhibitors or GPCR-targeted therapeutics.