A highly pure MUC1-derived glycopeptide dendrimer of 22 kDa was prepared by a sequential segment coupling, achieved by an N-alkylcysteine (NAC)-assisted thioesterification. The glycopeptide having C-terminal NAC was prepared by the Fmoc method and converted to the thioester 3-mercaptopgropionic acid treatment. The thioester was condensed with a lysine trimer carrying NAC to afford tetramer, which was then converted to the thioester. Two tetramers were condensed with ethylenediamine to give the octameric glycopeptide dendrimer.
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