(R)-Isoserine, also known as (R)-2-Amino-3-hydroxypropanoic acid, is a non-proteinogenic amino acid. It is a stereoisomer of the naturally occurring L-serine, featuring a hydroxyl group at the β-position relative to the amino and carboxyl groups. This specific chiral configuration makes it a valuable building block in organic and medicinal chemistry. Its primary significance lies in its role as a key chiral synthon for the synthesis of various biologically active compounds. (R)-Isoserine is notably used in the preparation of β-lactam antibiotics, such as certain carbapenems and penems, where its structure serves as a crucial component of the core ring system. It is also employed in the synthesis of enzyme inhibitors, peptide mimetics, and other pharmaceutical intermediates that require a chiral β-hydroxy-α-amino acid scaffold. Due to its specific stereochemistry and functional groups, (R)-Isoserine is considered a specialty chemical primarily for research and development in pharmaceutical synthesis rather than a bulk commodity. Its handling requires standard precautions for amino acids.