Three olean (β-amyrenone, β-amyrin and maniladiol), three ursane (α-amyrinone, α-amyrin and breine) and four tirucallane (3-oxotirucalla-8,24-dien-21-óic acid, 3α-hydroxytirucalla-8,24-dien-21-oic acid, 3α-acetoxytirucalla-8,24-dien-21-oic acid and 3α-hydroxytirucalla-7,24-dien-21-oic acid) triterpenes were isolated from the oleoresin of Protium hebetatum Daly. The structures were established mainly by 13C, 1D and 2D NMR spectroscopic analysis. The isolation of 3α-hydroxytirucalla-8,24-dien-21-oic acid permitted correction of the chemical shift assignments of some of its carbon atoms.
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