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2,5-Dioxo-7-m-tolyl-1,2,5,6,7,8-hexahydro-quinoline-3-carboxylic acid 2-Hydroxy-5-oxo-7-(m-tolyl)-5,6,7,8-tetrahydroquinoline-3-carboxylic acid 7-(3-methylphenyl)-2,5-dioxo-1,6,7,8-tetrahydroquinoline-3-carboxylic acid 2,5-diketo-7-(3-methylphenyl)-1,6,7,8-tetrahydroquinoline-3-carboxylic acid 7-(3-Methylphenyl)-2,5-dioxo-1,2,5,6,7,8-hexahydroquinoline-3-carboxylic acid