A nonpromoting phorbol from the Samoan medicinal plant Homalanthus nutans inhibits cell killing by HIV-1 - Gustafson, K R; Cardellina, J H; McMahon, J B; Gulakowski, R J; Ishitoya, J; Szallasi, Z; Lewin, N E; Blumberg, P M; Weislow, O S; Beutler, J A; Buckheit, R W; Cragg, G M; Cox, P A; Bader, J P; Boyd, M R (J Med Chem, 1992)