Z-Arg(Mbs)-OH · DCHA is a protected arginine amino acid derivative in which the α-amino group is carbobenzyloxy-protected (Z/Cbz) and the side-chain guanidinium is substituted with an Mbs (mesitylenesulfonyl) protecting group, yielding a structurally modified, peptide-synthesis-ready building block. The molecule contains a free α-carboxylic acid (-COOH) and a protected guanidinium functionality whose basicity is masked by the Mbs group, and it is provided as a DCHA salt, indicating association with dicyclohexylamine to form an ionic solid. In synthetic workflows, the orthogonal protection pattern supports chemoselective transformations and stepwise peptide assembly while the salt form can aid handling and controlled solubility during coupling and purification steps.
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