ethyl 8-ethyl-5,8-dihydro-5-oxo-2-(pyrrolidinyl)pyrido[2,3-d]pyrimidine-6-carboxylate;8-Ethyl-5,8-dihydro-5-oxo-2-(1-pyrrolidinyl)pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester
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