Boc-His(Trt)-Aib-Gln(Trt)-Gly-Gly-OH is a protected pentapeptide used in peptide synthesis. It includes histidine (His), α-aminoisobutyric acid (Aib), glutamine (Gln), and two glycine (Gly) residues. The Boc (tert-Butyloxycarbonyl) group protects the N-terminus of the histidine residue, while the Trt (Trityl) groups shield the side chains of histidine and glutamine, preventing premature reactions. The Aib residue adds conformational rigidity, and the two glycine residues at the C-terminus are free, indicated by -OH, allowing for further coupling or modifications. This peptide is designed to ensure controlled reactivity and stability throughout the synthesis process.