(1S,2S)-2-Aminocyclohexane-1-carboxylic acid hydrochloride is a chiral, non-proteinogenic amino acid derivative. It features a cyclohexane ring substituted with both an amino group and a carboxylic acid group, with both stereocenters in the (S,S) configuration. The compound is typically supplied as a hydrochloride salt to enhance its stability and solubility. This chiral building block is primarily utilized in the pharmaceutical industry for the synthesis of peptide mimetics and other bioactive molecules. Its constrained cyclohexane backbone is valuable for introducing conformational rigidity into peptide chains, which can improve metabolic stability, receptor selectivity, and overall pharmacokinetic properties of drug candidates. It serves as a key intermediate in medicinal chemistry research. As a bifunctional molecule containing both a protected amine (as the HCl salt) and a carboxylic acid, it is also a versatile chiral synthon in organic synthesis. It can be used in peptide coupling reactions and for constructing more complex, conformationally restricted structures.