Olmesartan Impurity 6

5-Acetyl-2-propyl-1H-Imidazole-4-carboxylic Acid Ethyl Ester|ethyl 4-acetyl-2-propyl-1H-imidazole-5-carboxylate|Ethyl 4-Acetyl-2-propyl-1H-imidazole-5-carboxylate;