1,2,3,4-Tetrahydro-2,4-dioxo-3-quinolinecarboxylic acid 143049-22-3 2,4-Dioxo-3H-quinoline-3-carboxylic acid 3-Quinolinecarboxylic acid, 1,2,3,4-tetrahydro-2,4-dioxo- BRN 5813583