1-Methyl-4-oxo-1,6,7,8-tetrahydro-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid ethyl ester;4,6,7,8-Tetrahydro-1-methyl-4-oxo-1H-pyrido[1,2-a]pyrimidine-3-carboxylic acid ethyl ester
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