A new benzoquinone (1-hydroxybenzoisochromanquinone) and benz [g]isoquinoline-5, 10-dione have been isolated from the woody parts of Psychotria camponutans, as a result of bioactivity-guided fractionation. The compounds were characterized by UV, IR, EI-mass, 1H-, and 13C-NMR, and HETCOR NMR spectroscopy. Both compounds, together with acetylbenzoisochromanquinone, showed in vitro strong activity against brine shrimp, KB cells, and chloroquine-resistant P. falciparum.