1-methyl-2-oxo-1,2-dihydro-3-pyridinecarboxylic acid
1-methyl-2-oxopyridine-3-carboxylic acid 2-keto-1-methyl-nicotinic acid 1-methyl-2-oxo-1H-pyridine-3-carboxylic acid
1-methyl-2-oxopyridin-3-carbonsäure acide 1-méthyl-2-oxopyridine-3-carboxylic 1-メチル-2-オキソピリジン-3-カルボン酸
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