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Bioassay guided fractionation against α-glucosidase and separation of the ethanolic extract of Pasania formosana leaf by chromatographic methods led to the isolation of a novel secocycloartane triterpene. This compound, named pasasecocycloartenoic acid, was elucidated as 21,24( R)-epoxy-25-hydroxy-3,4-secocycloart-4(28)-en-3-oic acid through analysis of 1D and 2D NMR spectra and on the basis of HRESIMS data. The compound showed weak activity against α-glucosidase, but its poor solubility hampered the bioassay.

A Novel 3,4-Secocycloartane Triterpene, Bearing a Tetrahydropyran Moiety, from Pasania formosana Leaf