1H and13C-NMR analysis of four pentasaccharides from urine of blood-group A and B, Leb adults. Confirmation of the structure of two new oligosaccharides: Fuc(?1?2)[GalNAc(?1?3)]Gal(?1?3)[Fuc(?1?4)]Glc and Fuc(?1?2)[Gal(?1?3)]Gal(?1?3)[Fuc(?1?4)]Glc

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