The molecule is a trisaccharide composed of a beta-L-rhamnosyl residue linked (1->4) to a beta-D-glucosyl residue which is in turn linked (1->4) to beta-D-galactose.
(2R,3R,4R,5R,6S)-2-[(2R,3S,4R,5R,6S)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2R,3R,4R,5R,6R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-6-methyloxane-3,4,5-triol