Structure of the type XXVII Streptococcus pneumoniae (pneumococcal) capsular polysaccharide

Abstract
The type XXVII S. pneumoniae (pneumococcus) capsular polysaccharide contains equimolar amounts of D-glucose, D-galactose, L-rhamnose, 2-amino-2-deoxy-D-glucose, acetyl, pyruvic acid, phosphate and choline. Structural investigations involving methylation studies and characterization of oligosaccharides obtained by 3 different degradations indicate the structure of the complete repeating unit to be .**GRAPHIC**.