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Three novel tetracyclic triterpenoids from the SLPC. (A) Chemical structures of compounds PZC, PZD and PZE. (B) Key HMBC correlations (from H to C) for compounds PZC, PZD and PZE. (C) Key NOESY correlations for compounds PZC, PZD and PZE. (D) Plausible biosynthetic pathway of compound PZD.
