The molecule is a carbohydrate lactone obtained by intramolecular condensation of the 6-carboxy group with the 3-hydroxy group of alpha-mannofuranuronic acid. It has a role as a metabolite. It is a furofuran, a gamma-lactone and a carbohydrate lactone.
(2S,3S,3aR,6R,6aR)-2,3,6-trihydroxy-3,3a,6,6a-tetrahydro-2H-furo[3,2-b]furan-5-one