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. Author manuscript; available in PMC: 2019 Jun 25.
Published in final edited form as: J Agric Food Chem. 2018 Jul 24;66(30):7859–7872. doi: 10.1021/acs.jafc.8b02602

Figure 1.

Figure 1.

Key structural skeletons of momilactone and related diterpenoids. (I) (9β-H)-pimarane; (II) 16-nor-(9β-H)-pimarane; (III) 17-nor-(9β-H)-pimarane; (IV) 19-nor-(9β-H)-pimarane; (V) 15,16,17-tri-nor-(9β-H)-pimarane; (VI) 17-nor-pimarane; (VII) 16,17-di-nor-pimarane; (VIII) 17,19-di-nor-pimarane; (IX) rearranged 17-nor-pimarane