N-Carbobenzoxy-L-phenylalanyl-L-phenylalanine (Z-Phe-Phe-OH) is a protected dipeptide intermediate used in peptide synthesis. It features the carbobenzoxy (Cbz) protecting group on the N-terminal amino group of the L-phenylalanyl-L-phenylalanine dipeptide, enabling selective formation of peptide bonds by preventing unwanted reactions at the amino terminus. This compound serves as a building block for constructing longer peptides, particularly those containing the Phe-Phe sequence, such as in studies of amyloid formation or bioactive peptides. The Cbz group can be readily removed via hydrogenation or acidolysis without damaging the peptide chain, ensuring high purity and yield in synthesis. It is widely applied in organic synthesis, medicinal chemistry, and pharmaceutical research for developing peptide-based therapeutics and investigating enzyme-substrate interactions.