A series of mono-and dimeric natural and structurally modified carbazo
les has been tested for activity against Plasmodium falciparum. One of
the monomers, the synthetic compound 1,4-diacetoxy-3-methylcarbazole
(17), displays the highest activity, with an IC50 value of 1.79 mu g/m
l. It is distinctly more active than the as yet best natural compound,
1-hydroxy-3-methylcarbazole (4) (4).