The molecule is a trisaccharide that is D-glucopyranose in which the hydroxy groups at positions 4 and 6 have been converted into the corresponding alpha-D-glucopyranosyl and alpha-D-galactopyransoyl derivatives, respectively.
(2R,3R,4S,5R,6S)-2-(hydroxymethyl)-6-[[(2R,3S,4R,5R)-4,5,6-trihydroxy-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol