The molecule is a pentasaccharide derivative composed of a 4-O-methyl-beta-D-glucuronic acid (at the non-reducing end) and four beta-D-galactose units all joined via (1->6)-linkages.
(2S,3S,4R,5R,6R)-4,5-dihydroxy-3-methoxy-6-[[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4S,5R)-3,4,5,6-tetrahydroxyoxan-2-yl]methoxy]oxan-2-yl]methoxy]oxan-2-yl]methoxy]oxan-2-yl]methoxy]oxane-2-carboxylic acid