1,3-Propanediamine, N,N'-bis(2-aminoethyl)- 1,4,8,11-Tetraazaundecane 1,4,8,11-Tetrazaundecane 1,9-Diamino-3,7-diazanonane 2,3,2-Tetramine 4741-99-5 96760-19-9 AI3-61714 EINECS 225-254-1 Ethylenetrimethyleneethylenetetramine N,N'-Bis(2-aminoethyl)propane-1,3-diamine NSC 19173