Abstract
From the neutral fraction of the resin of Protium heptaphyllum, a mixture of α- and β-amyrin, a mixture of maniladiol and brein have been isolated as main components, and the novel 3β,24-dihydroxy-urs-12-ene (1), 3-oxo-20 S-hydroxytaraxastane (2) and 3β,20 S-dihydroxytaraxastane (3) as minor components. NMR data of the last three compounds are provided.
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