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None None None Screening of the Pathogen Box reveals new starting points for anti-trypanosomal drug discovery N9-Substituted 2,4-Diaminoquinazolines: Synthesis and Biological Evaluation of Lipophilic Inhibitors of Pneumocystis carinii and Toxoplasma gondii Dihydrofolate Reductase Synthesis and Biological Evaluation of 2,4-Diamino-6-(arylaminomethyl)pyrido[2,3-d]pyrimidines as Inhibitors of Pneumocystis carinii and Toxoplasma gondii Dihydrofolate Reductase and as Antiopportunistic Infection and Antitumor Agents None Characterization of 2,4-Diamino-6-oxo-1,6-dihydropyrimidin-5-yl Ureido Based Inhibitors of Trypanosoma brucei FolD and Testing for Antiparasitic Activity Pneumocystis carinii and Toxoplasma gondii Dihydrofolate Reductase Inhibitors and Antitumor Agents:  Synthesis and Biological Activities of 2,4-Diamino-5-methyl-6-[(monosubstituted anilino)methyl]- pyrido[2,3-d]pyrimidines Inhibition of Plasmodium falciparum Hsp90 Contributes to the Antimalarial Activities of Aminoalcohol-carbazoles