|This article does not cite any references or sources. (December 2009)|
There are few examples of C-7 sugars in nature, among which are:
- Sedoheptulose or D-altro-heptulose (a ketose), an early intermediate in lipid A biosynthesis
- Mannoheptulose, found in avocados
- L-glycero-D-manno-heptose (an aldose), a late intermediate in lipid A biosynthesis.
Ketoheptoses have 4 chiral centers, whereas aldoheptoses have 5.
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