Structures of four new triterpenes from the rhizomes of Polypodium juglandifolium

Abstract

Four new triterpenes isolated from the rhizomes of Polypodium juglandifolium have been identified on the basis of chemical and spectral evidence as fern-9(11)-en-6α-ol (I), fern-9(11)-en-20β-ol (III), 24,24-dimethyl-9,19-cyclolanost-25-en-3β-ol (V), and hopan-29-ol (VII). The acetates of the last two compounds occur in the same plant material.