glucose
24
O
O
O
O
C
O
H
C
H
H
C
H
C
H
H
H
H
C
H
H
O
C
H
H
12 21
12 2
12 14
12 13
21 10
21 20
21 9
10 17
10 0
10 19
17 7
17 5
17 6
7 4
7 1
7 22
4 20
4 3
4 15
3 11
1 8
5 16
0 23
2 18