The molecule is a disaccharide that is alpha-D-galactopyranose in which the hydroxy group at position 4 has been converted into the corresponding beta-D-galactofuranoside. It is a glycoside and a glycosylgalactose. It derives from a beta-D-galactose and a beta-D-galactofuranose.
(2S,3R,4R,5R,6R)-5-[(2S,3R,4R,5S)-5-[(1R)-1,2-dihydroxyethyl]-3,4-dihydroxyoxolan-2-yl]oxy-6-(hydroxymethyl)oxane-2,3,4-triol