Casearin X, its degradation product and other clerodane diterpenes from leaves of Casearia sylvestris: evaluation of cytotoxicity against normal and tumor human cells - dos Santos, A G; Ferreira, P M; Vieira Júnior, G M; Perez, C C; Gomes Tininis, A; Silva, G H; Bolzani Vda, S; Costa-Lotufo, L V; Pessoa Cdo, O; Cavalheiro, A J (Chem Biodivers, 2010)