Bioactive friedolanostanes and 11(10→8)-abeolanostanes from the bark of Garcinia speciosa - Vieira, L.M.M.; Kijjoa, A.; Wilairat, R.; Nascimento, M.S.J.; Gales, L.; Damas, A.M.; Silva, A.M.S.; Mondranondra, I.-O.; Herz, W. (Journal of Natural Products, 2004)