A rare sugar is a sugar that occurs in limited quantities in nature.^[2] Rare sugars can be made using enzymes, choosing which enzymes to use if you know the substrate can be aided by the Izumoring-strategy.^[3]

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Specific examples of rare sugars are:

• Allulose^[4]
• Allose^[5]
• Sorbose^[2]
• Tagatose^[2]