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