2-Formylcinchoninic acid methylhydrazone hydrate 4-Quinolinecarboxylic acid, 2-((methylhydrazono)methyl)-, monohydrate 62604-49-3 CINCHONINIC ACID, 2-FORMYL-, 2-METHYLHYDRAZONE Cinchoninic acid, 2-formyl-, methylhydrazone, monohydrate