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5-(2-chlorophenyl)-1-(2-phenylethyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione 5-(2-chlorophenyl)-2-hydroxy-1-(2-phenylethyl)pyrido[2,3-d]pyrimidin-4(1H)-one Pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione, 5-(2-chlorophenyl)-1-(2-phenylethyl)-