Isolation and structural characterization of novel neutral oligosaccharide-alditols from respiratory-mucus glycoproteins of a patient suffering from bronchiectasis. 1. Structure of 11 oligosaccharides having the GlcNAcβ(1→3)Galβ(1→4)GlcNAcβ(1→6)GalNAc-ol structural element in common.