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- Anti-Pneumocystis carinii and antiplasmodial activities of primaquine-derived imidazolidin-4-onesPublication . Vale, Nuno; Collins, Margaret S.; Gut, Jiri; Ferraz, Ricardo; Rosenthal, Philip J.; Cushion, Melanie T.; Moreira, Rui; Gomes, PaulaA series of primaquine-derived imidazolidin-4-ones were screened for their in vitro activity against Pneumocystis carinii and Plasmodium falciparum W2 strain. Most compounds were active against P. carinii above 10 lg/mL and displayed slight to marked activity. The imidazolidin-4-ones most active against P. carinii were also those most active antiplasmodial agents, in the lM range. One of the tested imidazolidin-4-ones was slightly more active than the parent primaquine and may represent a lead com pound for the development of novel anti-P. carinii 8-aminoquinolines with increased stability and resistance to metabolic inactivation.