Porcine cholecystokinin-pancreozymin (CCK), which is a 33 amino acid peptide having a sulphated tyrosyl residue at position 27, was synthesized by the classical solution procedure applying our maximum protection strategy, for which the phenoxyacetyl group was used for the first time for protection of Ser residues.
Y. Kurano, T. Kimura and S. Sakakibara, J. Chem. Soc., Chem. Commun., 1987, 323 DOI: 10.1039/C39870000323
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