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. 2020 Jul 31;2020:1920683. doi: 10.1155/2020/1920683

Figure 2.

Figure 2

(a) Chemical structure of three pentacyclic triterpenoids isolated from the Q. crispula Blume outer bark [50]. (b) Eight new triterpenoids (1−8) isolated from Q. petraea [89]. (c) 12 new triterpenoids identified from oak heartwood Q. robur [90].