A heptose is a monosaccharide with seven carbon atoms. They have either an aldehyde functional group in position 1 (aldoheptoses) or a ketone functional group in position 2 (ketoheptoses). There are few examples of C-7 sugars in nature, among which are: Ketoheptoses have 4 chiral centers, whereas aldoheptoses have 5. ...
A sugar with seven carbon atoms in its molecule; e.g., sedoheptulose. ... (05 Mar 2000) ... 
(hep´tōs) a sugar whose molecule contains seven carbon atoms.
Type: Term Pronunciation: hep′tōs Definitions: 1. A sugar with seven carbon atoms in its molecule; sedoheptulose.