1,3-Propanediamine, N,N'-bis(3-(ethylamino)propyl)- 121749-39-1 BE 3-3-3 DENSPM De 333 N(1),N(11)-Diethylnorspermine N(sup 1),N(sup 11)-Bis(ethyl)norspermine N(sup 1),N(sup 11)-Diethylnorspermine N,N'-Bis(3-(ethylamino)propyl)-1,3-propanediamine N1,N11-Bis(ethyl)norspermine N1,N11-Diethylnorspermine