(S)-Cyclohexylglycine hydrochloride is a non-proteinogenic amino acid derivative, specifically the hydrochloride salt of the (S)-enantiomer of cyclohexylglycine. It features a cyclohexyl side chain attached to the alpha-carbon of a glycine backbone, making it a chiral, non-natural amino acid building block. This compound is primarily employed as a key chiral intermediate in pharmaceutical research and development. Its structural motif is valuable for introducing conformational constraints and lipophilicity into peptide-based drug candidates and other bioactive molecules. It is used in the synthesis of various pharmacologically active compounds, including enzyme inhibitors and potential therapeutic agents targeting neurological and metabolic disorders. As a protected amino acid derivative in salt form, it offers enhanced stability and handling properties for solid-phase peptide synthesis (SPPS) and other organic transformations. Its chirality is crucial for achieving desired biological activity and selectivity in the final drug molecules.