These steps are repeated to elongate the oligosaccharide chain with the required sugar units.
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dimethylthexylsilyl O-(methyl 2-O-levulinoyl-3-O-benzyl-4-O-(9-O-fluorenylmethoxycarbonyl)-β-D-glucopyranosyluronate)-(1->4)-O-2-azido-3-O-benzyl-2-deoxy-6-O-acetyl-β-D-glucopyranoside
(2,5-diiodo-1,4-phenylene)bis(methylene)bis(4-methylbenzoate)
