They have either an aldehyde useful gathering in position 1 (aldoheptoses) or a ketone utilitarian gathering in position 2 (ketoheptoses).
There are few samples of C-7 sugars in nature, among which are:
Sedoheptulose or D-altro-heptulose (a ketose), an early moderate in lipid A biosynthesis
Mannoheptulose, found in avocados
L-glycero-D-manno-heptose (an aldose), a late moderate in lipid A biosynthesis.
Ketoheptoses have 4 chiral focuses, while aldoheptoses have 5.
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