#ketose  any monosaccharide sugar that contains a ketone group or its hemiacetal
  supertype:  #monosaccharide__monosaccharose__simple_sugar  a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates
  subtype:  #ketohexose  a monosaccharide having six carbon atoms and a ketone group
     subtype:  #fructose__fruit_sugar__fruitsugar__levulose__laevulose  a simple sugar found in honey and in many ripe fruits

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