The structure of the Shigella boydii type 5 O-antigen polysaccharide h
as been investigated by sugar and methylation analyses, and specific d
egradations. It is proposed that it is composed of hexasaccharide repe
ating units with the following structure. The repeating unit also cont
ains an O-acetyl group, linked to one of the primary positions. [GRAPH
ICS] --> 3)-beta-D-Manp-(1 --> 4)-beta-D-Manp-(1 --> 4)-beta-D-GlcpA-(
1 --> 3)-alpha-D-GlcpNAc-(1 --> 2)-beta-D-Galp-(1 -->