Syntheses of model oligosaccharides of biological significance. X. Syntheses and NMR and mass spectral analysis of trideuteriomethyl di-3, 6-O-(4-O-β-D-galactopyranosyl-2-acetamido-2-deoxy-β-D- glucopyranosyl)-β-D-galactopyranoside: The I antigen branchpo

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