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Synthesis of glycopeptide SGRRhaNAAIVK. a, SiPhH3 (phenylsilane), Pd(PPh3)4, CH2Cl2; b, 1-(tert-butoxycarbonyl)-3-(2,3,4-tri-O-acetyl-6-deoxy-l-mannopyranos-1-yl)-2-ethyl-isothiourea (26) AgNO3 (silver nitrate), NEt3 (triethylamine), DMF; c, N2H4·H2O (5% solution in DMF); d, TFA-H2O-phenol-TIPS (88/5/5/2).
