The molecule is a disaccharide phosphate consisting of alpha-D-galactosyl-(1->3)-alpha-D-glucose having a alpha-L-rhamnosyl-(1->4)-D-ribitol-5-phosphate moiety attached at the 2-position of the galactose via a phosphodiester linkage. It derives from a ribitol.
[(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-[(2S,3R,4S,5R,6R)-2,3,5-trihydroxy-6-(hydroxymethyl)oxan-4-yl]oxyoxan-3-yl] [(2R,3S,4S)-3,4,5-trihydroxy-2-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxypentyl] hydrogen phosphate