A clear trend of decreasing activity (from pIC 50 7.1 for 11 to pIC 50 < 4.2 for 21d and 21f ) can be correlated with the increasing size of the R 2 substituent.
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Lead Optimization of the 5-Phenylpyrazolopyrimidinone NPD-2975 toward Compounds with Improved Antitrypanosomal Efficacy.
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