The molecule is a linear trisaccharide consisting of three alpha-D-rhamose units joined by an alpha-(1->2)- and an alpha-(1->3)- linkage. It has a role as an epitope.
(2S,3S,4S,5R,6R)-4-[(2R,3S,4S,5S,6R)-4,5-dihydroxy-6-methyl-3-[(2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl]oxy-6-methyloxane-2,3,5-triol