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Structures of ursane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021). (a) Compounds U1, U4, U5, U8, U10, U12, U18, U22–U24, U34–42, U52–U55, U57, U64, U68–U73, U76–U78 and U84. (b) Compounds U2, U3, U6, U7, U9, U11, U13–U17, U19–U21, U25–U33, U43–U51, U56, U58–U63, U79–U83 and U85. (c) U65–U67, U74, U75, U86–U88.
