1,4-Butanediamine, N,N'-bis(4,5,6,7-tetrahydro-1H-1,3-diazepin-2-yl)-, dihydriodide 82911-00-0 N,N'-Bis(4,5,6,7-tetrahydro-1H-1,3-diazepin-2-yl)-1,4-butanediamine dihydriodide