1-((tert-Butoxycarbonyl)amino)cyclopropanecarboxylic acid is a bifunctional organic compound featuring both a carboxylic acid group and a tert-butoxycarbonyl (Boc)-protected amino group attached to a cyclopropane ring. This structure makes it a versatile chiral building block, particularly valuable for introducing the constrained cyclopropane moiety into target molecules. Its primary application is in pharmaceutical research and development as a key intermediate for synthesizing active pharmaceutical ingredients (APIs). The cyclopropane ring is a privileged scaffold in medicinal chemistry due to its ability to confer conformational rigidity, metabolic stability, and improved binding affinity to drug candidates. This specific Boc-protected amino acid derivative is instrumental in constructing peptide mimetics and non-peptidic compounds targeting various diseases. The compound serves as a crucial precursor for drugs like the hepatitis C virus (HCV) protease inhibitor boceprevir and other investigational therapeutic agents. Its utility extends to the synthesis of conformationally restricted gamma-aminobutyric acid (GABA) analogues and other bioactive molecules, highlighting its importance in modern drug discovery programs.