6,7,8,9-Tetrahydro-7-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-acetic acid ethyl ester;7-Methyl-4-oxo-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidine-3-acetic acid ethyl ester
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