M. Frederich et al., 10 '-hydroxyusambarensine, a new antimalarial bisindole alkaloid from the roots of Strychnos usambarensis, J NAT PROD, 62(4), 1999, pp. 619-621
Reinvestigation of Strychnos usambarensis Gilg resulted in the isolation of
a tertiary phenolic bisindole alkaloid, 10'-hydroxyusambarensine (1), whic
h was identified by detailed spectroscopic methods. Compound 1 was moderate
ly active against two strains of Plasmodium falciparum in vitro.