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Synthesis of UDP-MurNAc-hexapeptide (l-Ala) from UDP-MurNAc-pentapeptide. Reagents and conditions were as follows: acetonitrile, EDC, NHS, l-alanine-Fmoc, pH 5.0, 20 min (a); UDP-MurNAc-pentapeptide, NaHCO3, pH 10.0, 3 h (b1); piperidine, 30 min (b2).
