The Structure of the Capsular Polysaccharide of Klebsiella K-type 72; Occurrence of 3,4-O-(1-Carboxyethylidene)-L-rhamnose

Methylation and partial hydrolysis studies on the capsular polysaccharide of Klebsiella K72 show the structure to consist of a repeating unit The anomeric linkages were determined in isolated oligosaccharides by p.m.r. spectroscopy which also showed the presence in the polysaccharide of one pyruvate ketal per four sugar residues.