Two novel triterpenoid saponins, phelasin A (1) and phelasin B (2), were isolated from the bark of Anthocephalus cadamba (Roxb) Miq. The structures were established by one- and two-dimensional 1H and 13C NMR spectroscopy. The aglycone of 1, phelasingenin (3), is a new compound characterized as 3β-hydroxy-olean-18-ene-27,28-dioic acid. Molecular mechanics and molecular dynamics studies carried out on 3 showed the preferred conformation adopted by the molecule.
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Sahu et al. (1999) studied this question.
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