(3-Fluoropyridin-2-yl)methanamine dihydrochloride312904-49-731 % similar 1H-Imidazole-2-carboxylic acid16042-25-430 % similar 2-Nitroimidazole527-73-130 % similar 4-Fluoro-1H-pyrrolo[2,3-b]pyridine640735-23-530 % similar