Atractylodimers A-D, unprecedented sesquiterpenoid dimers with cage-like skeletons from Atractylodes macrocephala and their neuroprotective activities.

Atractylodimers A-D (1-4), sesquiterpenoid dimers (SDs) featuring a unique cage-like structure, were isolated from the rhizomes of Atractylodes macrocephala. The most distinctive characteristic of these isolates was the highly twisted "cap" structure…

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