Oleanane-, ursane-, and quinone methide freidelane-type triterpenoid derivatives: recent advances in cancer treatment - Salvador, J AR; Leal, A S; Valdeira, A S; Gonçlaves, B MF; Alho, D PS; Figueiredo, S AC; Silvestre, S M; Mendes, V IS (Eur J Med Chem, 2017)