Used primarily in peptide synthesis as a protected amino acid derivative, this compound enables selective coupling reactions by shielding the amine group with the Fmoc (fluorenylmethyloxycarbonyl) protecting group. The sulfonate group enhances water solubility, making it suitable for use in aqueous or mixed solvent systems, which is beneficial in solid-phase peptide synthesis and bioconjugation processes. Its D-alanine backbone is useful in the preparation of peptides with specific stereochemical configurations, often applied in research involving enzyme substrates, inhibitors, or structurally modified bioactive peptides.