Bioassay-guided isolation of antimalarial triterpenoid acids from the leaves of Morinda lucida - Cimanga, R K; Tona, G L; Mesia, G K; Kambu, O K; Bakana, D P; Kalenda, P D; Penge, A O; Muyembe, J T; Totté, J; Pieters, L; Vlietinck, A J (Pharm Biol, 2008)