2-(2-Pyridyl)cinchoninic acid 2-(2-Pyridyl)cinchoninsaeure [German] 4-Quinolinecarboxylic acid, 2-(2-pyridinyl)- 7491-86-3 CINCHONINIC ACID, 2-(2-PYRIDYL)- Kyselin 2-(2-pyridyl)-cinchoninova [Czech]