Imidazole is an organic compound with the formula C3N2H4 that is a white colorless solid soluble in water and various organic solvents. It has two tautomeric structures due to the mobile hydrogen atoms between the two nitrogen atoms. Imidazole is amphoteric, acting as both a weak acid and base. It is used in pharmaceuticals as a starting material for antifungal drugs like clotrimazole and ketoconazole. Imidazole is also used as a pesticide, insecticide, and corrosion inhibitor for metals.