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Structures of artemisinin and its analogues. (a) Artemisinin. (b) An early derived peroxide with less antimalarial potency. (c) An analogue with close structure to artemisinin. (d) An antimalarial tetraoxane. (e) OZ277. (f, g and h) Enantiomers with similar activities against malaria parasites. (i) thapsigargin.
