(S)-2-((tert-Butoxycarbonyl)amino)-3-hydroxypropanoic acid（Cat No.:R061474）is a modified amino acid derivative used in peptide synthesis. It features a tert-butoxycarbonyl (Boc) group on the amino group, which protects it from unwanted reactions during peptide formation. The compound contains a hydroxy group at the 3-position of the propanoic acid side chain, which provides potential for further chemical modifications, such as esterification or glycosylation. The Boc group can be removed under mild acidic conditions, revealing the free amino group for peptide elongation or other modifications. This compound is useful in both synthetic chemistry and bioengineering applications.