the sequence of monosaccharides in the biological repeating tetrasaccharide unit of shigella flexneri variant y o-antigenic polysaccharide chain was determined by subjecting three oligosaccharides of the polysaccharide , obtained by phage-sf6-mediated enzymatic hydrolysis , to methylation analysis and proton nuclear magnetic resonance spectroscopy .
C0028959
oligosaccharides
C0032594
polysaccharide