Browsing by Author "Medeiros, J."
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- A novel pentacyclic triterpene from Leontodon filiiPublication . Tostão, Z.; Noronha, J.P.; Cabrita, E.J.; Medeiros, J.; Justino, Jorge; Bermejo, J.; Rauter, A. P.A novel oleanene triterpenetetrol was isolated from the chloroform extract of the aerial parts of Leontodon filii. Its structure was shown to be 2β,3β,15α,21β-olean-12-ene-2,3,15,21-tetrol by chemical and spectroscopic methods. The fungicidal efficacy of the chloroform and methanol extracts of the plant was also evaluated, a protective effect being found against Plasmopara viticola, Botrytis cinerea, particularly powerful against Pyricularia oryzae.