In Vitro Antiplasmodial Activity of Tithonia diversifolia and Identification of its Main Active Constituent: Tagitinin C - Goffin, Eric; Ziemons, Eric; De Mol, Patrick; de Madureira, Maria do Céu; Martins, Ana Paula; da Cunha, Antonio Proença; Philippe, Geneviève; Tits, Monique; Angenot, Luc; Frederich, Michel (Planta Medica, 2002)