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Two rare rearranged cuparane‐type sesquiterpenoid C‐10 epimers [beshanzuenones A (1) and B (2)] and two bisabolane‐type sesquiterpenoid spirolactones [beshanzuenones C (3) and D (4)] featuring an unusual [6/6/5]‐fused tricyclic ring system were isolated from the shed trunk barks of Abies beshanzuensis, one of the critically endangered plant species in the world. The structures of these four new enone‐containing...
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