3,12-Diaza-6,9-diazoniadispiro(5.2.5.2)hexadecane, 3,12-bis(1-oxo-3-((phenylmethyl)amino)propyl)-, dichloride 95461-35-1 N,N'''-Di(beta-(N-benzyl)aminopropionyl)-N',N''-dispirotripiperazinium dichloride