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Chemoenzymatic preparation of fucosylated backbones 17, 18, 19, 20, 21 and 22. The condition of chemical sulfation is SO3/Py (4 equiv), DMF/TEA (V/V = 1:1), 0–40 °C, and 3–4 h for (b,e) and SO3/Py (15 equiv), DMF/Py (V/V = 1:1), 0 °C, and 1–2 h for (c).
