The molecule is a beta-D-Galp-(1->4)-alpha-D-Galp-(1->3)-D-Galp in which the carbon bearing the anomeric hydroxy group has beta- configuration. It derives from a beta-D-Galp-(1->4)-alpha-D-Galp and an alpha-D-Galp-(1->3)-beta-D-Galp.
(2R,3R,4S,5S,6R)-4-[(2R,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-(hydroxymethyl)oxane-2,3,5-triol