Antiprotozoal properties of 16,17-dihydrobrachycalyxolide from Vernonia brachycalyx. - Oketch-Rabah HA; Brøgger Christensen S; Frydenvang K; Dossaji SF; Theander TG; Cornett C; Watkins WM; Kharazmi A; Lemmich E (Planta medica, 1998)