The molecule is a glycosyl alditol that is D-galactitol in which the hydroxy groups at positions 2 and 3 have been converted into the corresponding alpha-L-fucopyranosyl and alpha-D-galactopyranosyl derivatives, respectively.
(2R,3S,4S,5S)-4-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-5-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyhexane-1,2,3,6-tetrol