4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid;4-Oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid hydrochloride;4-Oxo-4H-pyrido[1,2-a]pyrimidin-3-carbonsaeure;4-oxo-4H-pyrido[1,2-a]-3-carboxylic acid;ethyl 4-oxo-4H-pyrimido<1,2-a>pyrimidine-3-carboxylate;4-oxo-4H-pyrimido[1,2-a]pyrimidine-3-carboxylic acid ethyl ester
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