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A series of novel pyrido[2,3-b]pyrazines were synthesized as potential antitumor agents for erlotinib-resistant tumors. Known signal inhibitor compounds from our Nested Chemical Library were tested in phenotypic assays on erlotinib-sensitive PC9 and erlotinib-resistant PC9-ER cell lines to find a compound class to be active on erlotinib resistant cell lines. Based on the screening data, novel pyrido[2,3-b]pyrazines...
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