Pentacyclic triterpenes
Friedelane
Hopane
H
OH
O
25-Hydroxy-3-friedelanone
H
H
H
H
H
OH
Hopan-22-ol
Lupane
Oleanane
O
H
H
H
H
Lupeol
O
H
H
H
β-Amyrin
Serratane
H
H
O
H
H
OH
OH
3, 14, 21-Serratanetriol
Modified triterpenes
Limonoids
Quassinoids
O
O
O
H
H
O
OH
OH
O
MeO
O
O
O
AcO
O
MeO
O
H
Azadirachtin
A limonoid from Azadirachta indica (Neem)
O
O
O
O
OMe
MeO
H
H
H
Quassin
A quassinoid from Quassia amara
Steroids
O
H
H
H
O
Progesterone
A female sex hormone
6.5 TERPENOIDS
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