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Cbz-Sar-Sar-Sar-Sar-OH is a protected tetrapeptide composed of four sarcosine (Sar) residues, a derivative of glycine with a methyl group on the nitrogen atom. The Cbz (Carbobenzyloxy) group protects the N-terminus of the first sarcosine residue, while the C-terminus of the final sarcosine residue is free, indicated by -OH, allowing for further coupling or modifications. This tetrapeptide is designed to introduce a flexible, non-chiral sequence into peptide chains, often used to modify the physical properties of the resulting peptide, such as increasing solubility or altering conformation. The protective groups ensure that the synthesis proceeds in a controlled and selective manner.
