Fmoc-Hyp(But)-OH is a high-quality, protected form of (2S,4R)-4-tert-butoxycarbonyl-4-methylproline, an important derivative of hydroxyproline, commonly used in peptide synthesis. This product features the Fmoc (9-fluorenylmethyloxycarbonyl) protecting group, ensuring stability during peptide assembly. With its exceptional purity and consistent quality, Fmoc-Hyp(But)-OH serves as a valuable building block for the efficient and reliable synthesis of peptides containing modified hydroxyproline residues.