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