Imidazo[1,2-a]pyridine-6-carboxaldehyde, 2-[4-[[(4,5-dihydro-1H-imidazol-2-yl)hydrazono]methyl]phenyl]-, (4,5-dihydro-1H-imidazol-2-yl)hydrazone, dihydroiodide NSC375162