(2S,4S,5R,6R)-2,4,5-trihydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylate (2S,4S,5R,6R)-2,4,5-trihydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]tetrahydropyran-2-carboxylate (2S,4S,5R,6R)-2,4,5-trihydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]-2-tetrahydropyrancarboxylate