[(2R,3R,4R,5R)-2,3,4,5-tetrahydroxy-6-oxohexyl] phosphate [(2R,3R,4R,5R)-2,3,4,5-tetrahydroxy-6-oxo-hexyl] phosphate [(2R,3R,4R,5R)-2,3,4,5-tetrahydroxy-6-keto-hexyl] phosphate