The molecule is a glycosylarabinose consisting of aldehydo-D-arabinose having a beta-D-galactopyranosyl residue at the 3-position. It is a tautomer of a beta-D-Gal-(1->3)-D-Ara.
(2S,3R,4R)-2,4,5-trihydroxy-3-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxypentanal