The molecule is a glycosylarabinose consisting of D-arabinose having a beta-D-galactosyl residue at the 3-position. It is a tautomer of a 3-O-beta-D-galactopyranosyl-D-arabinose.
(2R,3R,4S,5R,6S)-2-(hydroxymethyl)-6-[(3S,4R,5R)-2,3,5-trihydroxyoxan-4-yl]oxyoxane-3,4,5-triol