The molecule is a branched hexasaccharide comprised of five alpha-D-mannose residues linked as shown and also to a 3-deoxy-alpha-D-manno-oct-2-ulosonic acid (3-deoxy-D-manno-oct-2-ulosonic acid; Kdo) residue at the reducing end, corresponding to the core oligosaccharide of the phytopathogenic bacterium Rhizobacterium radiobacter strain Rv3.
(2R,4R,5R,6R)-6-[(1R)-1,2-dihydroxyethyl]-5-[(2R,3S,4S,5R,6R)-4-[(2R,3S,4S,5S,6R)-3-[(2R,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2S,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,5-dihydroxy-6-[[(2S,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxy-2,4-dihydroxyoxane-2-carboxylic acid