Fmoc-Tyr(All)-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) methods. It serves as a protected form of tyrosine, where the Fmoc group safeguards the amino group, and the All (allyl) group protects the hydroxyl group of the tyrosine side chain. This dual protection allows for selective deprotection during peptide chain assembly, enabling precise control over the synthesis process. The compound is especially valuable in synthesizing complex peptides and proteins where tyrosine residues are present, as it prevents unwanted side reactions. Additionally, its compatibility with Fmoc-based SPPS makes it a staple in research and pharmaceutical development for creating peptides with specific biological activities or structural properties.