1,3-Propanediamine, N,N'-bis(2-aminoethyl)- 1,4,8,11-Tetraazaundecane 1,4,8,11-Tetrazaundecane 1,9-Diamino-3,7-diazanonane 3,7-Diazanonane-1,9-diamine 4741-99-5 Ethylenetrimethyleneethylenetetramine N,N'-BIS(2-AMINOETHYL)-1,3-PROPANEDIAMINE N,N'-Bis(2-aminoethyl)propane-1,3-diamine NSC19173