Used in peptide synthesis as a protected amino acid building block, particularly for introducing iodinated alanine residues into peptide chains. The Fmoc group allows for solid-phase synthesis under mild basic conditions, while the iodine atom serves as a handle for further modification via cross-coupling reactions such as Suzuki or Sonogashira. Commonly applied in the development of radiolabeled peptides, enzyme inhibitors, or probes for biochemical studies. The methyl ester protects the carboxylic acid during chain assembly and can be selectively removed under esterolytic or mild hydrolytic conditions later in the synthesis.