Scheme 2. Synthesis of spacer-equipped GXM oligosaccharides. (A) Serotype A hexasaccharide acceptor (B) serotype D pentasaccharide acceptor. Reagents and conditions: (a) DDQ, DCM : H2O, rt; (b) thiourea, NaHCO3, TBAI, dry. THF, 65 °C.
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