2-Formylcinchoninic acid amidinohydrazone 4-Carboxyquinolyl-2-aldehyde guanylhydrazone 4-Quinolinecarboxylic acid, 2-(((aminoiminomethyl)hydrazono)methyl)- 81735-31-1 CINCHONINIC ACID, 2-FORMYL-, AMIDINOHYDRAZONE