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Chemoenzymatic preparation of disaccharide backbones 6, 9, 12, and 15. The condition of chemical sulfation is SO3/Py (4 equiv), DMF/TEA (V/V = 1:1), 0 °C–40 °C, and 3–4 h. Deprotection of TBS is performed by adjusting pH to 3.0 using 1 M AcOH(aq).
