Complement-Inhibiting Constituents of Bridelia ferruginea Stem Bark - Cimanga, Kanyanga; De Bruyne, Tess; Apers, Sandra; Pieters, Luc; Totté, Jef; Kambu, Kabangu; Tona, Lutete; Bakana, Phongi; van Ufford, Linda Quarles; Beukelman, Cees; Labadie, Rudi; Vlietinck, Arnold J (Planta Medica, 1999)