is 1, 2, 3, 4, 5. Namely, five of the carbons have one hydroxyl functional group each, connected by a single bond, and one has an oxo group , forming a carbonyl group . The remaining bonds of the carbon atoms are satisfied by seven hydrogen atoms. The carbons are commonly numbered 1 to 6 starting at the end closest to the carbonyl.

Hexoses are extremely important in biochemistry,