Part 6. For part 5, see: Chaturvedula VSP, Schilling JK, Miller JS, Andriantsiferana, R, Rasamison V, Kingston DGI. New cytotoxic bis-5-alkylresorcinol derivatives from the leaves of Oncostemon bojerianum from the Madagascar rainforest - Biodiversity,Conservation and Drug Discovery in Madagascar. (J Nat Prod, 2002)