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4,5-Imidazoledicarboxylic acid 1H-Imidazole-2-carboxylic acid Imidazo[1,2-b]pyridazine imidazo[1,2-a]pyridine-6-carboxylic acid Ethyl iMidazo[1,5-a]pyridine-5-carboxylate Imidazo[1,5-a]pyridine-5-carboxylic acid, 5,6,7,8-tetrahydro- iMidazo[1,2-a]pyriMidine-6-carboxylic acid Imidazo[1,5-a]pyridine-8-carboxylic acid (9CI)