- Protective effect of alpha- and beta-amyrin, a triterpene mixture from Protium heptaphyllum (Aubl.) March. trunk wood resin, against acetaminophen-induced liver injury in mice. Oliveira, F.A., Chaves, M.H., Almeida, F.R., Lima, R.C., Silva, R.M., Maia, J.L., Brito, G.A., Santos, F.A., Rao, V.S. Journal of ethnopharmacology. (2005)