58
COOH
OH
OH
O
OH
OH
59
60
61
62
Fig. 40 Structures of 58–62
8
PPO
PPO
H
H
H 2 O
OH
Fig. 41 The mechanism of
14-membered ring
formation by the type 1
terpene cyclases
24
T. Mitsuhashi and I. Abe