;Ethyl 8-allyl-5-hydroxy-2-(methylthio)-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylate;7,8-dihydro-5-hydroxy-2-(methylthio)-7-oxo-8-(2-propenyl)pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester
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