Boc‑4‑iodo‑L‑phenylalanine 62129-44-6 for peptide synthesis off white crystalline powder Product Overview Boc‑4‑iodo‑L‑phenylalanine, also known as Boc‑Phe(4‑I)‑OH, belongs to protected unnatural aromatic amino acids. A tert butoxycarbonyl group attaches to the amino terminus, shielding the amine group and preventing undesired coupling during peptide assembly. The iodine atom on benzene para position provides distinctive heavy atom signature for analytical detection. This