Chemical Studies on Mexican Plants Used in Traditional Medicine, XXI. Ratibinolide II, a New Sesquiterpene Lactone from Ratibida latipalearis

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Abstract
Ratibinolide II, a new eudesmanolide, and the known flavanone hispidulin have been isolated from Ratibida latipalearis. The structure elucidation of the new compound was unequivocally established by spectral and X-ray crystallographic analyses.