Dipeptide-58 D-Phenylalanyl Arginyl D-Tryptophyl Tetrapeptide-90 Amide is the synthetic peptide based on the protein, Pro-Opiomelanocortin, and contains 9 amino acids consisting of Dipeptide-58, D-phenylalanine, alanine, D-tryptophan, and Tetrapeptide-90 in which the C-terminus is an amide.