The type XXVII Streptococcus 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 three different degradations indicate the structure of the complete repeating unit to be[Formula: see text]
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Bennett et al. (1977) studied this question.