The molecule is a disaccharide derivative consisting of two 3-deoxy-alpha-D-manno-oct-2-ulopyranonosyl units joined via an alpha-(2->4)-linkage with an O-allyl group at the anomeric centre. It has a role as an antigen.
(2R,4R,5R,6R)-2-[(2R,4R,5R,6R)-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxy-2-prop-2-enoxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid