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Amino acids bearing 4‐methylbenzyl (MBn) and 4‐methoxybenzyl (MPM)‐protected sialic acid were synthesized and used for the 9‐fluorenylmethoxycarbonyl (Fmoc) solid‐phase synthesis of a glycopeptide. The α‐sialyl linkage of the MBn‐protected unit was partially cleaved under the final deprotection by trifluoroacetic acid (TFA). In addition, the removal of several MBn groups were incomplete. On the other...
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