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The frond exudates of the two gymnogrammoid ferns, Notholaena peninsular is and N. pallens, consist mainly of a diterpene, accompanied by small amounts of flavonoid aglycones. The diterpenes from both sources are shown to be identical. Their structure has been established by spectroscopic methods as (-)-kaur-16-ene-19-oic acid. This result is confirmed by direct comparison with an authentic sample.

Ent-Kaurenoic Acid: A Diterpene as Frond Exudate on Ferns of the Genus Notholaena