J Nat Prod. 1991 Sep-Oct; 54(5): 1279-82.

Chemical studies on Mexican plants used in traditional medicine, XXI. Ratibinolide II, a new sesquiterpene lactone from Ratibida latipalearis.

Rojas A, Villena R, Jiménez A, Mata R.

Facultad de Química, Centro Universitario, Universidad Autónoma de Queretaro, México.

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.

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