The molecule is a galactonolactone that is the D-enantiomer of galactono-1,5-lactone. It is an aldono-1,5-lactone and a galactonolactone. It derives from a D-galactonic acid.
(3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-one