1,4-Dihydro-4-oxoquinoline-2-carboxylic acid13593-94-730 % similar Kynurenic acid492-27-330 % similar 2-Hydroxyquinoline-4-carboxylic acid84906-81-030 % similar 2-Chloro-1H-indole-3-carbaldehyde5059-30-330 % similar 2-Methylindole-3-carboxaldehyde5416-80-830 % similar Imiquimod99011-02-630 % similar