https://doi.org/10.1351/goldbook.K03387
Ketonic parent @S06088@ (polyhydroxyketones H–[CHOH]n–C(=O)[CHOH]m–H with three or more carbon atoms) and their @I03130@ @H02774@. The oxo group is usually at C-2. E.g. d-fructose:
K03387.png