The guttiferones, HIV-inhibitory benzophenones from Symphonia globulifera, Garcinia livingstonei, Garcinia ovalifolia and Clusia rosea - Gustafson, K R; Blunt, J W; Munro, M H; Fuller, R W; McKee, T C; Cardellina, J H, II; McMahon, J B; Cragg, G M; Boyd, M R (Tetrahedron, 1992)