84280-28-4 Polysaccharide type Ia group B, streptococcal Strep polysaccharide B Ia Streptococcal polysaccharide Ia group B beta-D-Galactopyranose, O-(N-acetyl-alpha-neuraminosyl)-(2-3)-O-beta-D-galactopyranosyl-(1-4)-O-2-(acetylamino)-2-deoxy-beta-D-glucopyranosyl-(1-3)-O-(beta-D-glucopyranosyl-(1-4))-