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R
H
H
H
H
O
O
H
HO
H
HO
H
O
H
O
O
O
O
O
O
O
14
R=H
15
R=
16
17
18
α
-OH
H
H
H
H
O
H
HOOC
H
H
HO
MeOOC
HOH
2
C
R
O
19
20
R =CH
2
23
R = CH
3
22
21
H
H
H
H
O
O
O
O
O
O
O
HOOC
O
O
O
24
25
26
27
H
H
H
O
O
O
O
O
O
O
O
O
O
O
O
28
29
30
31
H
H
O
OH
O
H
OH
CO
2
H
O
O
O
32
33
34
35
Structure 5-3. Structures of sesquiterpenes isolated from A. annua (1972-2004).
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