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pubmed-article:10715167pubmed:abstractTextThrough computationally directed broad screening, a novel 1, 5-diphenylpyrazole (DPP) class of HIV-1 nonnucleoside reverse transcriptase inhibitors (NNRTIs) has been discovered. Compound 2 (PNU-32945) was found to have good activity versus wild-type (IC(50) = 2.3 microM) and delavirdine-resistant P236L (IC(50) = 1.1 microM) reverse transcriptase (RT). Also, PNU-32945 has an ED(50) for inhibition of viral replication in cell cultures of 0.1 microM and was shown to be noncytotoxic with a CC(50) > 10 microM. Structure-activity relationship studies on the 3- and 4-positions of PNU-32945 led to interesting selectivity and activity within the class. In particular, the 3-hydroxyethyl-4-ethyl congener 29 is a potent inhibitor of the P236L mutant (IC(50) = 0.65 microM), whereas it is essentially inactive versus the wild-type enzyme (IC(50) > 50 microM). Furthermore, this compound was significantly more active versus the P236L mutant than delavirdine. The synthesis and RT inhibitory activity of various 3- and 4-substituted analogues are discussed.lld:pubmed
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pubmed-article:10715167pubmed:pagination1034-40lld:pubmed
pubmed-article:10715167pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:10715167pubmed:articleTitleNovel 1,5-diphenylpyrazole nonnucleoside HIV-1 reverse transcriptase inhibitors with enhanced activity versus the delavirdine-resistant P236L mutant: lead identification and SAR of 3- and 4-substituted derivatives.lld:pubmed
pubmed-article:10715167pubmed:affiliationCombinatorial and Medicinal Chemistry Research, Infectious Diseases Research, Discovery Technologies, Pharmacia & Upjohn, Inc., Kalamazoo, Michigan 49001, USA. michael.j.genin@am.pnu.comlld:pubmed
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