A polymeric fraction containing D-galactose, N-acetyl-D-galactosamine, and
N-acetyl-D-glucosamine was isolated from. the lipopolysaccharide produced b
y the reference strain for Acinetobacter baumannii serogroup O1. By means o
f NMR spectroscopy, methylation analysis, and chemical degradation, the rep
eating unit of the polymer was identified as a branched trisaccharide of th
e following structure.
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